List some uses of convex and concave lens.

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Solution

Uses of concave lens:

(i) Telescopes

(ii) Spectacles

(iii) Door hole lenses

Uses of convex lens:

(i) Telescopes

(ii) Spectacles

(iii) Microscopes

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Question 4

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

(a) concave mirror or convex mirror.

(b) concave mirror or convex lens.

(d) concave lens or convex lens.

1) state two practical use of convex lens and concave lens?

Question 7

You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

(a) both concave lens and convex lens.

(b) both concave mirror and convex mirror.

(d) Both convex mirror and concave lens.

(a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram.
(b) State whether the convex lens has a real focus or a virtual focus. (c) List some things that convex lens and concave mirror have in common.

Q. Which lens is used in peepholes of the door?
a)concave lens
b)convex lens

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List some uses of convex and concave lens.

Uses of concave lens: (i) Telescopes (ii) Spectacles (iii) Door hole lenses Uses of convex lens: (i) Telescopes (ii) Spectacles (iii) Microscopes

Uses of concave lens:

(i) Telescopes

(ii) Spectacles

(iii) Door hole lenses

Uses of convex lens:

(i) Telescopes

(ii) Spectacles

(iii) Microscopes