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प्रश्न
Part of the eye which controls the entering of light is called
पर्याय
iris
cornea
lens
retina
उत्तर
iris
Explanation -
Iris is a dark muscular structure behind the cornea, which controls the amount of light entering into the eye.
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संबंधित प्रश्न
Write true or false of the following statement.
The image formed by a plane mirror can be obtained on a screen.
State four characteristics of the image formed by a plane mirror.
If the angle between the mirror and the reflected ray is 23∘, what is the angle of incidence of the incidence ray?
Explain the following term:
Angle of incidence
Draw diagram/diagrams to show them.
Describe the principle of simple periscope through an outline ray diagram. Give one of its uses.
An object 1.5 cm high when placed in front of a concave. the mirror produces a virtual image 3 cm high. If the object is placed at a distance of 6 cm from the pole of the mirror, calculate:
- the position of the image
- the focal length of the mirror.
State whether the following statement is true or false. If false, correct it.
The image in a plane mirror is situated in the mirror.
Define reflection.
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?
 |
 |
| A | B |
 |
 |
| C | D |
