Question

An optical device forms an erect image of an object placed in front of it. If the size of the image is one half of that of the object, the optical device is a :
a) concave mirror
b)convex mirror
c)plane mirror
d)convex lens

Answer 1

Answer:

convex mirror

Explanation:

Convex mirror produces virtual erect image of the object which is smaller than the original object, after reflection.

hence the answer is convex mirror

Answer 2

The optical device is CONVEX MIRROR.

(Option b) :

• First of all , the optical device is producing an erect image of the object.

• In all types of lens and mirrors, it is seen that erect images are always virtual in nature.

• Also, the device is producing an image which is half in size as that of the object. This means magnification is +½.

This is possible only in case of convex mirrors, which always produce virtual, erect and diminished images irrespective of the position of the object

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