A hole is made in a convex lens. Then
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The focal length of a plano-convex lens having a radius of curvature of 10 cm for convex surface and a refractive index of 1.5 will be
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Refractive index of a material for infrared light is
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When white light moves through vacuum
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Magnifying power of a compound microscope is the ratio of the angle formed by the final image to the angle formed by the object when
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Total internal reflection of light is possible when light enters from
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If in a plano-convex lens the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm then the refractive index of the material of lens will be
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Laser is
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f = r/2 is valid
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The number of images observable between two parallel mirrors is
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A ray of light is incident on a plane mirror at an angle of incidence 300. The ray after reflection is deviated through
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Spherical air bubble in water will act as
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