1
Focal length of plane mirror is
Answer: At infinity
Questions
3
A concave mirror gives real, inverted and same size image if the object is placed
Answer: At C
5
A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
Answer: Between P and F
7
Convex lens focus a real, point sized image at focus, the object is placed
Answer: At infinity
9
The refractive index of a rarer medium with respect to a denser medium is...
Answer: Smaller Than 1
10
The radius of curvature of a mirror is 20cm the focal length is
Answer: 10cm
11
The refractive index of a denser medium with respect to a rarer medium is...
Answer: Greater Than 1
12
A boy is standing at a distance of 2 m in front of a plane mirror.The distance between the boy and his image is ________ m.
Answer: 4
13
The incident ray passing through the focus(F) of a mirror ______ after reflection.
Answer: Becomes Parallel To The Principal Axis
14
The optical phenomena, twinkling of stars, is due to
Answer: Atmospheric refraction
15
In optics an object which has higher refractive index is called
Answer: Optically denser
16
Which of the following is a true statement?
Answer: The power of a convex lens is positive
18
According to the sign convention, the distance of object...
Answer: Is always negative
