NCERT Exemplar Class 12
A small pin fixed on a table top is viewed from above from a distance of 50cm. By what distance would the pin appear to be raised, if it be viewed from the same point through a 15cm. Thick glass slab held parallel to the table ? μ of glass 1.5 Does the answer depend on location of the slab ?
19
Nov
A small pin fixed on a table top is viewed from above from a distance of 50cm. By what distance would the pin appear to be raised, if it be viewed from the same point through a 15cm. Thick glass slab held parallel to the table ? μ of glass 1.5 Does the answer depend [...]
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A small pin fixed on a table top is viewed from above from a distance of 50cm. By what distance would the pin appear to be raised ,
if it be viewed from the same point through a 15cm. Thick glass slab held parallel to the table ? μ of glass 1.5 Does the answer depend on location of the slab ? ,
a) Determine the effective focal length of the combination of the two lenses of focal length 30cm and -20 cm. if they are placed 8.0cm apart with their principal axes coincident. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notions of effective focal length of this system useful at all? b) An object 1.5 cm in size is placed on the side of the convex lens in the arrangement a) above. The distance between the object and the convex lens is 40cm. Determine the magnification produced by the two-lens system, and the size of the image.
19
Nov
a) Determine the effective focal length of the combination of the two lenses of focal length 30cm and -20 cm. if they are placed 8.0cm apart with their principal axes coincident. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notions of effective focal length [...]
(a) Fig. shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the axis of the pipe for which total reflection inside the pipe take place as shown. (b) What is the answer if there is no outer covering if the pipe ?
19
Nov
(a) Fig. shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the axis of the pipe for which total reflection inside the pipe take place as shown. (b) What is the [...]
Use the mirror equation to deduce that: (a) an object placed between f and 2f of a concave mirror produces a real image beyond 2f. (b) a convex mirror always produces a virtual image independent of the location of the object. (c) the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole. (d) an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.
19
Nov
Use the mirror equation to deduce that: (a) an object placed between f and 2f of a concave mirror produces a real image beyond 2f. (b) a convex mirror always produces a virtual image independent of the location of the object. (c) the virtual image produced by a convex mirror is always diminished in size [...]
A compound microscope consists of an objective lens of focal length 2.0cm and an eyepiece of focal length 6.25cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at: (a) the least distance of distinct vision (25cm), and (b) at infinity? What is the magnifying power of the microscope in each case?
19
Nov
A compound microscope consists of an objective lens of focal length 2.0cm and an eyepiece of focal length 6.25cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at: (a) the least distance of distinct vision (25cm), and (b) at infinity? [...]
For light diverging from a point source 1. the wavefront in spherical. 2. the intensity decreases in proportion to the distance squared.
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Nov
For light diverging from a point source 1. the wavefront in spherical. 2. the intensity decreases in proportion to the distance squared. For light diverging from a point source 1. the wavefront in spherical. 2. the intensity decreases in proportion to the distance squared. November 19, 2020 Category: Chapter 10 - Wave Optics , NCERT [...]
Consider the diffraction pattern for a small pinhole. As the size of the hole is increased
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Nov
Consider the diffraction pattern for a small pinhole. As the size of the hole is increased Consider the diffraction pattern for a small pinhole. As the size of the hole is increased November 19, 2020 Category: Chapter 10 - Wave Optics , NCERT Exemplar Class 12 , Physics ,
Consider sunlight incident on a pinhole of width 10^3 Å. The image of the pinhole seen on a screen shall be
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Nov
Consider sunlight incident on a pinhole of width 10^3 Å. The image of the pinhole seen on a screen shall be Consider sunlight incident on a pinhole of width 10^3 Å. The image of the pinhole seen on a screen shall be November 19, 2020 Category: Chapter 10 - Wave Optics , NCERT Exemplar Class [...]
Two source S1 and S2 of intensity I1 and I2 are placed in front of a screen [Figure a]. The pattern of intensity distribution see in the central portion is given by Figure b. In this case which of the following statement are true.
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Nov
Two source S1 and S2 of intensity I1 and I2 are placed in front of a screen [Figure a]. The pattern of intensity distribution see in the central portion is given by Figure b. In this case which of the following statement are true. Is Huygen's principle valid for longitudinal sound waves? November 19, 2020 [...]
Consider sunlight incident on a slit of width 10^4 Å . The image seen through the slit shall
19
Nov
Consider sunlight incident on a slit of width 10^4 Å . The image seen through the slit shall Consider sunlight incident on a slit of width 10^4 Å . The image seen through the slit shall November 19, 2020 Category: Chapter 10 - Wave Optics , NCERT Exemplar Class 12 , Physics ,