Two concave lenses L1 and L2 are kept in...

Two concave lenses `L_1 and L_2` are kept in contact with each other. If the space between the two lenses is filled with a material of smaller refractive index, the magnitude of the focal length of the combination

becomes undefined

remains unchanged

increases

decreases

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HC VERMA-GEOMETRICAL OPTICS-Objective 1

A point source of light is placed in front of a plane mirror.
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Total internal reflection can take only if
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In image formatiion from spherical mirrors, only paraxial rays are con...
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A point object is placed at distance of 30 cm in front of a convex mi...
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Figure shows two rays A and B being reflected by a mirror and going as...
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The image formed by a concave mirror
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Figure shows figure three transparent medi of refractive indices mu1, ...
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Four modifications are suggested in the lens formula to incude the eff...
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A double convex lens has two surfaces of equal radii R and refractive ...
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A point source of light is placed at a distance of 2f from a convergin...
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A parallel beam of light is incident on a converging lens parallel to ...
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A symmetric double convex lens is cut in two equal parts by a plane pe...
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A symmetric doule convex lens is cut in two equal parts by a plane per...
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Two concave lenses L1 and L2 are kept in contact with each other. If t...
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A thin lens is made with as material having refractive index mu=1.5. b...
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A convex lens is made of a material having refractive index 1.2. Both ...
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A point object O is placed on the principal axis of a convex lens of f...
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The rays of different colours fail to converge at a point after going ...
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