Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 13

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An equi-biconvex lens $(μ = 1.5)$ of focal length $20 cm$ is cut into two parts and placed in contact as shown in the figure. A liquid of refractive index $1.3$ is filled between the two parts of lens. The equivalent focal length of the combination is (in $cm$ )

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Important Questions on Ray Optics and Optical Instruments

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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 14

A ray of light is refracted through a glass sphere of refractive index

\sqrt{3}

in such a way that it passes through the extremities of two radii which make an angle

120 °

with each other. If

δ °

is net deviation of ray, then value of

δ

is

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Gamma Question Bank for Engineering Physics>Chapter 26 - Ray Optics and Optical Instruments>Assignment>Q 16

A convex lens of focal length $20 cm$ and another convex lens of focal length $40 cm$ are placed co-axially. What should be the distance $d$ (in $cm$ ) between lenses so that final image of object $O$ is formed on $O$ itself?

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