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qUESTIONS

Two thin lenses have a combined power of +9D. When they are separated distance of 20 cm, then their equivalent power becomes +27/5 D. Their individual power (in dioptre) is respectively:

A compound microscope produces a magnification of 24 The focal length of the eyepiece is 5 cm. The final image is formed at the least distance of distinct vision. The magnification produced by the objective is:

A convex lens is dipped in a liquid whose refractive index is equal to refractive index of lens material. Then its focal length will:

A convex lens ‘A’ of focal length 20 cm and a concave lens ‘B’ of focal length 56 cm are kept along the same axis with the distance ‘d’ between them. If a parallel beam of light falling on A leaves B as a parallel beam, then the magnitude of distance d (in cm) is:

An equiconvex lens has radius of curvature R. The refractive index of the material of the lens when numerical value of R and focal length Fare same is:

The wavelength of light diminishes µ times (µ = 1.33 for water) in a medium. A diver from inside water looks at an object whose natural colour is green. He sees the object as

Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is

Monochromatic light is refracted from air into the glass of refractive index µ. The ratio of the wavelength of incident and refracted waves is

Speed of light is maximum in

A ray of light travelling inside a rectangular glass block of refractive index √2 is incident on the glass-air surface at an angle of incidence of 45°. The refractive index of air is Under these conditions the ray

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