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Relation between Focal Length and Radius of Curvature

A 10 mm long ...

Question

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

(a) -30 cm
(b) -20 cm
(c) -40 cm
(d) -60 cm

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Q. Question 2
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

(a) -30 cm
(b) -20 cm
(c) -40 cm
(d) -60 cm

Q. An object of length

4 c m

is placed in front of a concave mirror at a distance of

30 c m

. The focal length of mirror is

15 c m

. Where will the image form?

Q. An object is placed at a large distance in front of a concave mirror of radius of curvature 40 cm. The image will be formed in front of the mirror at a distance:

(a) 20 cm
(b) 30 cm
(c) 40 cm
(d) 50 cm

Q. An object is placed at a distance of

10 c m

from the concave mirror and the image is formed

20 c m

in front of the mirror. The focal length of the mirror is:

Q. A object is placed at

1 c m

in front of a concave mirror of focal length

10 c m

. Find image position.

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Relation between Focal Length and Radius of Curvature

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