Ray Optics and Optical Instruments

Related Questions

• Angle of deviation $(\delta $) by a prism (refractive index = $\mu $ and supposing the angle of prism A to be small) can be given by

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• The exposure time of a camera lens at the $\frac{f}{2.8}$ setting is $\frac{1}{200}$ second. The correct time of exposure at $\frac{f}{5.6}$ is

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• If the refractive indices of crown glass for red, yellow and violet colours are respectively ${{\mu }_{r\,}},\,\,{{\mu }_{y}}$ and ${{\mu }_{v}}$, then the dispersive power of this glass would be

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• A beam of light propagating in medium A with index of refraction n (A) passes across an interface into medium B with index of refraction n(B). The angle of incidence is greater than the angle of refraction; v(A) and v(B) denotes the speed of light in A and B. Then which of the following is true

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• A thin lens focal length ${{f}_{1}}$ and its aperture has diameter d. It forms an image of intensity I. Now the central part of the aperture upto diameter $\frac{d}{2}$ is blocked by an opaque paper. The focal length and image intensity will change to

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