# Physics MCQs for Competitive Exams 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