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Related Flashcards
Cards In This Set
| Front | Back |
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The angle of reflection is equal to the angle of incidence
a. Always b. sometimes c.under special conditions d. Never |
A
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The image formed by a plane mirror is :
a. Virtual behind the mirror and enlarged b. Virtual behind the mirror and of the same size as the object c. real ,at the surface of the mirror and enlarged d. Real . Behind the mirror and of the same size of the object |
B
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The least distance of distinct vision for a young adult with normal vision is about :
a. 25 m b. 2.5 cm c. 25 cm d.2.5 m |
C
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The angle between an incident ray and the plane mirror is 30 degree .the total angle between the incident ray and the reflected ray will be
a. 30 degree b. 60 degree c. 90 degree d. 120 degree |
D
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The image of an object formed by a plane mirror is
a . Virtual b. Real c. diminished d. Upside-down |
A
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Which of the following is a non-luminous object
a. sun b. star c. Moon d. fire |
C
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A device which works on the reflection of light from two plane mirrors arranged parall to one another is :
a. Electroscope b. kaleiodoscope c. periscope d. Stethoscope |
C
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The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is :
a. Two b. five c. one d. three |
D
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As the angle between two plane mirrors is decreased gradually the number of images of an object placed between them
a. Increased gradually b. decreases gradually c. first increases then decreases d. first decreases then increases |
A
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The deficiency of one of the following in the diet of a person for a considerable time can lead to a disease called night blindness.this one is
a. Vitamin B b. vitamin D c. Vitamin A d. Vitamin C |
C
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Which of the following is not a part of the human eye
a. Retina b. Auditory nerve c. Optic nerve d. Ciliary muscle |
B
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How does the eye change in order to focus on near or distant object
a. The lens moves in or out b . The lens moves in or out c. The lens becomes thicker or thinner d. The pupil becomes larger or smaller |
C
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Which of the following changes occur when you walk out of bright sunshine into a poorly lit room
a. The pupil becomes larger b. the lens becomes thicker c. The ciliary muscle relaxes d. The pupil becomes smaller |
A
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An incident ray makes an angle of 65 degree with the surface of a plane mirror.the angle of reflection in this case will be
a. 65 degree b. 45 degree c. 25 degree d. 35 degree |
C
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Which of the following produces diffuse reflection of light
a. Mirror on a dreesing table b. Water surface of a pond c. Screen in a cinema hall d. Polished wooden table |
C
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