If R is the radius of curvature of a spherical mirror and f is its focal length,then :
R = f
R = 2f
R = f/2
R = 3f
The sideways reversal of image by plane mirror is:
Lateral inversion
Parallax
Optical illusion
Optotune
The focal lengths of four convex lenses P,Q,R and S are 20 cm,15 cm,5 cm and 10 cm, respectively.The lens having greatest power is :
P
Q
R
S
The refraction of light is commonly known as
bending
scattering
reflection
interference
The mirror used in astronomical telescope :
Concave
Convex
Spherical
Plano-convex lenses
A man is using concave mirror for shaving.If his face is 20 cm from the mirror having magnification 2,what will be the radius of curvature of the mirror?
60 cm
80 cm
50 cm
40 cm
A converging lens has a focal length of 50 cm.The power of this lens is :
+0.2 D
-2.0 D
+2.0 D
-0.2 D
SI unit of power of lens is
metre
horse power
dioptre
watt
The sum of the reciprocals of object distance and image distance is equal to the
focal length of a mirror
reciprocal of the focal length
radius of curvature
magnification
What type of lens will form when a tumbler is filled with water?
Bi convex
Concavoconvex
Plano convex
Biconcave
