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Assertion : The focal length of the convex mirror will increase, if the mirror is placed in water.

Monjur Alahi

Directions : Each of these questions contains two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Assertion : The focal length of the convex mirror will increase, if the mirror is placed in water.
Reason : The focal length of a convex mirror of radius R is equal to , f = R/2.


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Salim Ahmed Kawsar

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(d) Focal length of the spherical mirror does not depend on the medium in which it placed.

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Find the focal length of a convex mirror whose radius of curvature is 32 cm

Here, R=32 cm ; f =? [convex mirror] f=R/2=32/2=16 cm.

1 Answers 2 views
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image,

Given, u=-10 cm, f=+15 cm,v=? From mirror formula, 1/f=1/v+1/u or 1/v=1/f=1/u =1/v=1/15=1/(-10)=1/15+1/10=(2+3)/30 or  v=30/5=+6 cm That is image is formed at a distance of 6 cm from the mirror behind it. The image is erect...

1 Answers 1 views
How can you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?

By observing the virtual images formed by the three mirrors, we can distinguish between the mirrors as: (i) Plane mirror will produce an image of the same size, (ii) Concave mirror will...

1 Answers 2 views
You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens.

(b) concave mirror or convex lens.

1 Answers 1 views
You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an

(b) concave mirror or convex lens.

1 Answers 1 views
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

(c) both concave mirror and convex lens.

1 Answers 1 views
An object is placed at a distance of 10 c m from convex mirror of focal length 15 cm......?

Given, u=-10 cm, f=+15 cm,v=? From mirror formula, 1/f=1/v+1/u or 1/v=1/f=1/u =1/v=1/15=1/(-10)=1/15+1/10=(2+3)/30 or  v=30/5=+6 cm That is image is formed at a distance of 6 cm from the mirror behind it. The image is erect and virtual.

1 Answers 1 views
A car is fitted with a convex side-view mirror of focal length 20cm.

The correct answer is:(b).

1 Answers 1 views
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

(d) 15 cm behind the mirror. EXPLANATION:  The option can be selected by suitable reasoning. In a convex mirror, the object at infinity has its image at the focus behind the mirror....

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An air bubble in water will act like a : (a) convex mirror (b) convex lens (c) concave mirror

(d) Air bubble in water would act as a diverging lens, because the index of refraction of air is less than that of water.

1 Answers 1 views

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