Physics Class 11 - Chapter 10 Optical Instruments Test - 4

Physics Class 11 - Chapter 10
Optical Instruments
Test - 4

1. The function of collimeter in spectrometer is?

a) To filter the light rays
b) No function
c) To produce parallel beams of light
d) To make them perpendicular

2. Dispersion effect may be produce error in light signals, this type of error is minimum in?

a) Multimode index fiber
b) Multimode graded index fiber
c) Monomode step index fiber
d) Single mode step index fiber

3. In multimode step index fiber the refractive index of core and cladding is?

a) Same
b) Zero
c) Different with refractive index of core higher than cladding
d) Different

4. Two convex lenses of equal focal lengths f are placed in contact, the resultant focal length of their combination is?

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

5. Final image produced by compound microscope is?

a) Real and erect
b) Real and inverted
c) Virtual and erect
d) Virtual and inverted

6. For normal adjustment ,length of astronomical telescope is?

a) Fo/fe
b) Fe/fo
c) Fo-fe
d) Fo+fe

7. If a convex lens of large aperture fails to converge the light rays incident in it to a single point, it is said to suffer from?

a) Chromatic aberration
b) None of these
c) Spherical aberration
d) Both of these

8. Michelson calculated the speed of light using the instrument?

a) Galvanometer
b) Interferometer
c) Spectrometer
d) None of these

9. A convex lens acts as a diverging lens if the?

a) The object is with C
b) Both b and c
c) Object is within f
d) Object is beyond the C

10. The least distance of distinct vision?a) Becomes infinite after certain age
b) Decrease with increase in age
c) Increase with increase in age
d) Neither increase nor decrease

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