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Image Formation by Convex Lens

Where must a ...

Question

Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?

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Solution

The light source must be placed at the focus of the convex lens.

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Q. In the collimator of a spectroscope to obtain parallel beam of light, the distance between slit and convex lens must be equal to :

Question 1
Which of the following can make a parallel beam of light when light from a point source is incident on it?

(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens

Where should an object be placed in front of a convex lens so as to obtain its virtual, erect and magnified image ?

Q. A converging lens of focal length

f_{1}

is placed in front of and coaxially with a convex mirror of focal length

f_{2}

. Their separation is

d

. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement.

Where should an object be placed in front of convex lens so as to obtain the image formed on slide projector?

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Image Formation by Convex Lens

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