Physics Class 11 - Chapter 10 Optical Instruments Test - 3

Physics Class 11 - Chapter 10
Optical Instruments
Test - 3

1. A concave lenses give virtual image only when the object lies?

a) Beyond 2f
b) At the principal focus
c) Between principal focus and optical center
d) Between principal focus and center of curvature

2. A convex and concave lens of focal length f are in contact , the focal length of combination will be?

a) infinite
b) f/2
c) Zero
d) F

3. Magnification of the astronomical telescope is?

a) 0
b) o+fe
c) Fo/fe
d) Fe/fo

4. In optical fiber transmit ion system for regenratering the dim light which is used?

a) Repeaters
b) iodes
c) Transformer
d) Laser

5. The value of critical angle for glass is?

a) 45
b) 52
c) 2
d) 47

6. Magnifying power of simple microscope?

a) Having no effect with it
b) Increase in increase in focal length
c) Increase with decrease in focal length
d) List distance of distinct vision

7. Image of an object 5 mm high is only 1 cm, magnification produced by lens is?

a) .5
b) .2
c) 4
d) 2

8. Error in the transmission of power through optic fiber can be minimized by using?

a) Copper wire
b) Single mode step index fiber
c) Graded index fiber
d) Multimode index fiber

9. In optic fiber transmission the repeater are separated in new system through a distance of?

a) 300km
b) 100km
c) 200km
d) 50 km

10. If an object is placed away from 2F of a converging lens, then the image will be?a) Virtual and erect
b) Real and erect
c) Virtual
d) Real and inverted

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