Question

Concave mirror will form virtual enlarged image when
A) u < f
B) u > f
C) f < u < 2f
D) u > 2f
3.The relation between Radius of curvature (R) and focal length (f) is
A) f = R
B) R = 2f
C) f = 2R
D) f = 3R
4.The mirrors used as shaving mirrors
A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Concave lens5.If angle of incidence of light ray on a concave mirror is 0°. What is the angle of reflection
A) 90°
B) 180°
C) 0°
D) None
6.Position of the object where the image is equal to an object size produced by concave mirror
A) At F
B) At C
C) Between P and F
D) Beyond C​

Answer 1

Answer:

1.A

2.C

3.A

4.D

5.B

6.B

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Answer 2

Answer:

1) Concave mirror forms an erect, virtual and enlarged image when the object is between focus and pole of mirror.

2) The relationship between the focal length f and radius of curvature r is r = 2f.

3) concave mirror is used in the case of shaving mirror because when the concave mirror is placed very close to the object, a magnified and virtual image is obtained.

4) Since the angle of incidence is 0 the angle of reflection is also 0 degree and this ray retraces its path

5) at centre of curvature