Optical Instruments Mcqs

This collections of Multiple choice questions and answers focuses on study of Optical Instruments in Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Optical Instruments in Physics comprehensively.

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Sciences MCQS

1.
A convex and concave lens of focal length f are in contact the focal length of the combinations will be

Zero

F / 2

2f

Infinite

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2.
A convex lens acts as a diverging lens if the

Object is beyond C

If the object is with in C

If the object is within f

Both (b) and (c)

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3.
A convex lens gives a virtual image only when the objects lies

Between principal focus and center of curvature

Beyond 2 f

At the principal focus

Between principal focus and optical center

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4.
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

F2 + f1

F2 - f1

F1f2/f2+f1

F1f2/f1-f2

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5.
A lens which converges a beam of parallel rays to a point is called

Diverging (or concave) lens

Converging (or convex) lens

Plano concave lens

Plano convex lens

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6.
A lens, which is thicker at the center and thinner at the edges is called

Concave lens

Convex lens

Plano convex lens

Plano concave lens

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7.
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called

Center of curvature

Focus

Optical center

Aperture

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8.
A spectrometer is used to find

Wave length of light

Refractive index of the prism

Wavelength of different colours

All of the above

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10.
Dioptre power of an concave lens of 10 cm focal length is

10 dioptre

10 dioptre

1 / 10 dioptre

1 / 10 dioptre

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11.
Dispersional effect may produce error in light signals. This type of error

Single mode step index fibre

Multimode step index fibre

Multimode graded index fibre

Monomode step index fiber

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12.
Errors in the transmission of power through optic fiber can be minimized by using a

Multimode index fiber

Graded index fiber

Single mode step index fiber

Copper wire

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13.
Final image produced by a compound microscope is

Real and inverted

Real and erect

Virtual and erect

Virtual and inverted

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15.
If a convex lens of focal length f is cut into two identical halves along the lens diameter the focal length of each half is

F

F/2

2f

3f/2

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