Physics MCQs for GRE Part 10

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Question:

In a compound microscope the object produces a magnification 10 and eyepiece produces a magnification 5. The overall magnification produced by the compound microscope is

  1. 2
  2. 5
  3. 2
  4. 50

Question:

The colour of the sky is due to

  1. Scattering of light
  2. Refraction of light
  3. Interference of light
  4. Reflection of light

Question:

An object is placed at a distance f12 from a convex lens of focal length f. The image will be at

  1. , real and inverted
  2. One of the foci, virtual, double the size of the object
  3. , real and inverted
  4. , virtual and erect

Question:

Two thin convex lenses of focal length are combined to gather, the focal length of the combination is

Question:

The focal length of a convex lens is minimum for

  1. Red
  2. Violet
  3. Blue
  4. Green

Question:

A biconvex lens of focal length is cut out into two Plano-convex lenses. The focal length of each part is

  1. 10cm
  2. 20cm
  3. 30cm
  4. 40cm

Question:

The minimum distance between the object and its real image formed by a convex lens of focal length f is

Question:

The refractive index of prism depends on

  1. Angle of the prism
  2. Deviation produced by the prism
  3. Intensity of light
  4. Wave length of light

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