Physics
(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?
(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.
Refraction Lens
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Answer
(a) According to the lens maker formula :
Focal length is a function of refractive index, hence for two different refractive indices there will be two different focal lengths.
Two different focal length implies two different images for same object.
Hence, 2 images will be formed.
(b) Concave lens because irrespective of the position of the object, the image formed by a thin concave (or divergent) lens is always virtual, upright, diminished, and it is situated on the side of the object between the focus and the lens.
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