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PHYSICS > 6. OPTICS > Flashcards

6. OPTICS Flashcards

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1
Q

The amount of light entering into eye can be controlled and regulated by-

A

pupil

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2
Q

________ is the front part of the eye. It allows light to enter the eye.

A

Cornea

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3
Q

________ is like a screen of the eye. It forms an image of the object.

A

Retina

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4
Q

Which instrument is used to measure the intensity of light produced by an unknown source in terms of a standard source?

A

Photometer

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5
Q

Rajat has hypermetropia. What type of lens will the ophthalmologist recommend to correct his vision?

A

Convex

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6
Q

Hypermetropia is also known as?

A

far-sightedness

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7
Q

The lens-type commonly used for correcting presbyopia is ______.

A

bifocal lens

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8
Q

The Tyndall Effect is due to:

A

Scattering of Light

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9
Q

The sky appears blue due to:

A

Scattering of light

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10
Q

Fulminology is the study of:

A

Lightening

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11
Q

What will be the size of the image formed by a concave mirror when an object placed between Pole and Focus?

A

Enlarged

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12
Q

Twinkling of stars is mainly due to which phenomenon?

A

Refraction

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13
Q

Which of the following is the instrument used in submarines to view objects above sea level ?

A

Periscope

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14
Q

Mirror used by dentists to see large images of teeth of patients is ______.

A

Concave Mirror

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15
Q

Image formed by a Plane Mirror is always ______.

A

Virtual and Erect

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16
Q

What is the name of the phenomena (derived by scattering of the light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?

A

Alpenglow

17
Q

What is the colour of the light emitted by the Sun?

A

White

18
Q

The total number of images
formed by two mirrors inclined at
120° to each other is ______

A

2
using n =(360/theta)-1

19
Q

Which among the following has
its refractive index closest to that of
crown glass?

A

Canada balsam

20
Q

The phenomenon of deviation of light rays from their original path, when they pass from one medium to another, is called ____

A

Refraction

PHYSICS (14 decks)

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