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Q.1: If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from——-?

  1. chromatic aberration
  2. spherical aberration
  3. both spherical and chromatic
  4. distortion

B

Q.2: A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is——-?

  1. f2 + f1
  2. f2 – f1
  3. f1f2/f2+f1
  4. f1f2/f1-f2

D

Q.3: In multimode step index fibre the refractive index of core and cladding is——?

  1. same
  2. different
  3. zero
  4. different with refractive index of core higher than cladding

D

Q.4: Final image produced by a compound microscope is——-?

  1. real and inverted
  2. real and erect
  3. virtual and erect
  4. virtual and inverted

D

Q.5: For normal adjustment, length of astronomical telescope is——-?

  1. fo + fe
  2. fo – fe
  3. fo / fe
  4. fe / fo

A

Q.6: Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is——-?

  1. zero
  2. focus
  3. 2 f
  4. f/2

D

Q.7: Least distance of distinct vision——-?

  1. increases with increase in age
  2. decreases with increase in age
  3. neither increases nor decreases
  4. becomes infinite after 60 years

A

Q.8: Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is———?

  1. 0.5
  2. 0.2
  3. 1
  4. 2

D

Q.9: A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called——-?

  1. center of curvature
  2. focus
  3. optical center
  4. aperture

B

Q.10: The value of critical angle for glass is——–?

  1. 42°
  2. 47°
  3. 52°
  4. 50°

A