JEE PHYSICS MCQ: RAY OPTICS

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A concave mirror has a focal length

20 \mathrm{~cm}

. The distance between the two positions of the object for which the image size is double of the object size is

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Correct option: A

20 \mathrm{~cm}

The correct answer is A (20 cm) because the distance between the two object positions is the difference between the object distances for real and virtual images with a magnification of 2.

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In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium A double convex lens is made of glass which has its refractive index 1,45 for violet rays and 1.50 for red rays. If the focal length for violet ray is

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