Ray Optics and Optical Instruments

Related Questions

• A concave lens of glass, refractive index $1.5$, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index $1.75$, it will behave as a

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• A double convex lens of focal length 20 cm is made of glass of refractive index 3 / 2. When placed completely in water ${{(}_{a}}{{\mu }_{w}}=4/3)$, its focal length will be

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• While using an electric bulb, the reflection for street lighting should be from

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• If the speed of light in vacuum is $C$ $m/\sec ,$ then the velocity of light in a medium of refractive index 1.5

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• If ${{I}_{1}}$ and ${{I}_{2}}$ be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by

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