Geometrical Optics Test

Result

Geometrical Optics Test - 1

Score
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Rank
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TIME Taken - -

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Question 1
1 / -0

Directions: In the following question, Statement - 1 (Assertion) is followed by Statement - 2 (Reason). The question has the following four options, out of which only one option is correct.

Statement - 1:

When a concave mirror is held under water, its focal length increases.

Statement - 2:

The focal length of a concave mirror is independent of the medium in which it is placed.

A
Both statements are true and statement - 2 is the correct explanation for statement - 1.

B
Both statements are true and statement - 2 is not the correct explanation for statement - 1.

C
Statement - 1 is true but, statement - 2 is false.

D
Statement - 1 is false but, statement - 2 is true.

Solution

The focal length of a concave mirror depends only on its radius of curvature not on the refractive index of the medium so first statement is wrong second statement is correct.
Question 2
1 / -0

In a compound microscope, the intermediate image is

A
real, inverted and magnified

B
real, erect and magnified

C
virtual, erect and magnified

D
virtual, erect and reduced

Solution

In a compound microscope, the object is placed just beyond the focus of the objective. Hence, the image formed by the object is real, inverted and highly magnified. Thus, the correct choice is (1).