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A compound telescope have two lenses A and B. Lens A is closer to object than lens B. Which statement is correct? a) Both A and B form real images. b) Both A and B form virtual images. c) A forms real image and B forms virtual image. d) A forms virtual image and B forms real image.

A compound telescope have two lenses A and B. Lens A is closer to object than lens B.
Which statement is correct?
a) Both A and B form real images.
b) Both A and B form virtual images.
c) A forms real image and B forms virtual image.
d) A forms virtual image and B forms real image.

Grade:Upto college level

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
In compound microscope both objective and eyepiece are convex lenses.

The objective has a very small focal length and hence has very high magnifying power (P∝1/f). It is positioned in such a way that the object is placed beyond its focal point and hence it forms a real, inverted and highly magnified image.

The image formed by objective serves as an object to the eyepiece. The position of eyepiece is kept such that the image formed by objective lens is formed within the focal length of the eyepiece. Hence, it forms a virtual and magnified image. This is similar to the working of a simple microscope which is also a convex lens and forms a virtual and erect image.
Vikas TU
14149 Points
3 years ago
onvex lens is made up of two different materials. The two different materials have two different refractive indices. So the lens have two different focal lengths. Hence two different images are formed.

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