Chapter 32 – Ray Optics
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Two thin lenses of focal length f1 and f2 are in contact and coaxial. The power of the combination is
20
Aug
Two thin lenses of focal length f1 and f2 are in contact and coaxial. The power of the combination is Two thin lenses of focal length f1 and f2 are in contact and coaxial. The power of the combination is August 20, 2020 Category: Chapter 32 - Ray Optics , NEET Last 32 Years Solved [...]
A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equi-convex lens of focal length 10 cm. The diameter of the Sun is 1.39×10^9m and its mean distance from the earth is 1.5×10^11m. What is the diameter of the Sun’s image on the paper ?
20
Aug
A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equi-convex lens of focal length 10 cm. The diameter of the Sun is 1.39×10^9m and its mean distance from the earth is 1.5×10^11m. What is the diameter of the Sun’s image on the paper ? A biconvex [...]
A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options best describe the image formed of an object of height 2 cm placed 30 cm from the lens?
20
Aug
A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options best describe the image formed of an object of height 2 cm placed 30 cm from the lens? A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options best [...]
A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively
20
Aug
A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively In total internal reflection when the angle of incidence is equal [...]
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid , it acts as a plane sheet of glass. This implies that the liquid must have refractive index
20
Aug
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid , it acts as a plane sheet of glass. This implies that the liquid must have refractive index it acts as a plane sheet of glass. This implies that the liquid must have refractive index When a biconvex lens of [...]
A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices μ1 and μ2 and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination is
20
Aug
A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices μ1 and μ2 and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination is In total internal [...]
A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is double of the other. Find the radii, if the refractive index of the material of the lens is 1.5.
20
Aug
A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is double of the other. Find the radii, if the refractive index of the material of the lens is 1.5. A double convex lens has focal length 25 cm. The radius of curvature of one of the [...]
An equi-convex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be
20
Aug
An equi-convex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be An equi-convex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be August [...]
Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is
20
Aug
Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is In total internal reflection when the angle of incidence [...]
Two similar thin equi-convex lenses, of focal length f each, are kept co-axially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerin (which has the same refractive index (μ=1.5) as that of glass) then the equivalent focal length is F2. The ratio F1:F2 will be
20
Aug
Two similar thin equi-convex lenses, of focal length f each, are kept co-axially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerin (which has the same refractive index (μ=1.5) as that of glass) then the equivalent focal length [...]