Chapter 9 – Ray Optics and Optical Instruments
Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 9 - Ray Optics and Optical Instruments
The direction of a ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1,2,3 and 4. Which of the four rays correctly shows the direction of reflected ray ?
19
Nov
The direction of a ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1,2,3 and 4. Which of the four rays correctly shows the direction of reflected ray ? 2 3 and 4. Which of the [...]
(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used, what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48×10^6 m, and the radius of lunar orbit is 3.8×10^8 m.
13
Nov
(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used, what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon, what is the diameter of the image of the [...]
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(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used ,
and the radius of lunar orbit is 3.8×10^8 m. ,
what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon ,
what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48×10^6 m ,
A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?
13
Nov
A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece? A mass attached to a spring is free to oscillate A prism is made of glass of unknown [...]
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A mass attached to a spring is free to oscillate ,
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism ,
A small candle ,
In Millikan's oil drop experiment ,
The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 ,
Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water ,
what is the speed of ejection of the liquid through the holes ? ,
with angular velocity ω ,
A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5 cm can bring an object placed at 9.0 mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope.
13
Nov
A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5 cm can bring an object placed at 9.0 mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of [...]
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A mass attached to a spring is free to oscillate ,
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism ,
A small candle ,
In Millikan's oil drop experiment ,
The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 ,
Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water ,
what is the speed of ejection of the liquid through the holes ? ,
with angular velocity ω ,
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
13
Nov
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses. What is the focal length of a convex lens of focal length 30 cm in contact with [...]
An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?
13
Nov
An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens? An object of size 3.0 cm is placed 14cm in front of a concave lens of focal [...]
A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20 cm, and (b) a concave lens of focal length 16 cm?
13
Nov
A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20 cm, and (b) a concave lens of focal length 16 cm? [...]
Tags:
A mass attached to a spring is free to oscillate ,
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism ,
A small candle ,
In Millikan's oil drop experiment ,
The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 ,
Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water ,
what is the speed of ejection of the liquid through the holes ? ,
with angular velocity ω ,
Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?
13
Nov
Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm? Double convex lenses are to be manufactured from a glass of refractive index 1.55 with both faces [...]
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism, the angle of minimum deviation is measured to be 40^o. What is the refractive index of the material of the prism? The refracting angle of the prism is 60 degree. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light. The refracting angle of the prism is 60^o.
13
Nov
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism, the angle of minimum deviation is measured to be 40^o. What is the refractive index of the material of the prism? The refracting angle of the prism is 60 [...]
Tags:
A mass attached to a spring is free to oscillate ,
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism ,
A small candle ,
In Millikan's oil drop experiment ,
The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 ,
Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water ,
what is the speed of ejection of the liquid through the holes ? ,
with angular velocity ω ,
Figures (a) and (b) show the refraction of a ray in air incident at 60^o with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in a glass when the angle of incidence in water is 45^o with the normal to a water-glass interface [Fig.(c)].
13
Nov
Figures (a) and (b) show the refraction of a ray in air incident at 60^o with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in a glass when the angle of incidence in water is 45^o with the normal to a water-glass interface [Fig.(c)]. Figures (a) and (b) show [...]