10th Class Physics MCQS
The line which passes through pole of the mirror and center of curvature is called principal:
Focus
Line
axis
None of these
An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?
9.9 cm
20 cm
4.1 cm
8.2 cm
A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
5.0 cm
15 cm
20 cm
7.5 cm
After refraction from a convex lens, rays of light parallel to the principal axis converge at a point, this point of convex lens is called:
Focal length
Optical center
Principal focus
Pole
A device which has two ways communication is:
Hard disk
Television
Radio
Mobile phone
When the object is placed beyond 2F of a convex lens, the image formed will be:
Real, inverted and smaller than the object
Real, inverted and of the same size as the object
Real, inverted and larger in size than the object
Virtual, erect and larger in size than the object
Totally reflecting prism turns the incident ray at an angle of:
60o
90o
45o
75o
An example of input device computer is:
Keyboard
monitor
printer
RAM
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