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Standard VII

Physics

Image Formation by Lenses

An image form...

Question

Question 8

An image formed by a lens is erect. Such an image could be formed by a

(a) convex lens provided the image is smaller than object.

(b) concave lens provided the image is smaller than object.

(c) concave lens provided the image is larger than object.

(d) concave lens provided the image is of the same size.

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Solution

Concave lens can produce image which can be erect given that the image is smaller than the object.

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Similar questions

A virtual image of an object is formed by a concave lens. The lens is then coupled (placed in contact) with a convex lens. A virtual image is again formed. The image, now

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.

Q. Image of an object at infinity is formed by a convex lens of focal length

30 c m

such that the size of the image is

2 c m

. If a concave lens of focal length

20 c m

is placed in between the convex lens and the image, at a distance

26 c m

from the convex lens, size of the new image is:

Match the following: [5 MARKS]

Column I	Column II
(a) A plane mirror	(i) Used as a magnifying glass.
(b) A convex mirror	(ii) Can form the image of objects spread over a large area.
(c) A convex lens	(iii) Used by dentists to see an enlarged image of teeth.
(d) A concave mirror	(iv) The image is always inverted and magnified.
(e) A concave lens	(v) The image is erect and of the same size as the object.
	(vi) The image is erect and smaller in size than the object.

Question 11
A virtual image larger than the object can be produced by a
(i) concave lens
(ii) concave mirror
(iii) convex mirror
(iv) plane mirror

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Image Formation by Lenses

Standard VII Physics

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