Ray Optics and Optical Instruments

Related Questions

• In a laboratory four convex lenses ${{L}_{1}},\,{{L}_{2}},\,{{L}_{3}}$ and ${{L}_{4}}$ of focal lengths 2, 4, 6 and 8 cm respectively are available. Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are

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• In the figure shown, for an angle of incidence ${{45}^{o}},$ at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face

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• The magnifying power of a simple microscope can be increased, if we use eye-piece of

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• Which of the following is not correct regarding the radio telescope

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• A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of ${{ heta }^{o}}$ where

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