Home
Class 8
PHYSICS
When we look at a dark room for some tim...

When we look at a dark room for some time, we start making out the shapes of different objects present in the room. Give the reason for the following questions.
(a) How does this happen?
(b) What do you think would happen to the pupils of a person looking at objects in a dark room? Why would this happen to the pupils?
(c) When we start seeing different objects in a dark room, we are often not able to recognize the colours of these objects. Why does this happen?

Text Solution

Verified by Experts

(a) In the dark room, pupil dilates after some time and allows sufficient light to enter the eye through it. This causes vision of shapes of different objects present in the dark room.
(b) Pupils dilate due to relaxation of ciliary muscles in the dark room so that the maximum amount of light can enter the eyes.
(c) It is so because we do not get proper reflection from the objects in a dark room.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • LIGHT

    PEARSON IIT JEE FOUNDATION|Exercise CLASSROOM CORNER (C. Long Answer Type Questions )|15 Videos

  • LIGHT

    PEARSON IIT JEE FOUNDATION|Exercise COMPETITION CORNER|59 Videos

  • LIGHT

    PEARSON IIT JEE FOUNDATION|Exercise CLASSROOM CORNER (A. Very Short Answer Type Questions) ( Assertion - Reason Type - Questions)|4 Videos

  • KINEMATICS

    PEARSON IIT JEE FOUNDATION|Exercise CONCEPT APPLICATION (Level 3) (Application Based Questions ) |5 Videos

  • MAGNETISM

    PEARSON IIT JEE FOUNDATION|Exercise CONCEPT APPLICATION (Level 3)|4 Videos

Similar Questions

Explore conceptually related problems

What do you think would happen to tides on Earth if Earth stopped rotating? Why?

What do you think would happen when a mixture of iron filings and sulphur powder is heated ?

Knowledge Check

  • We sit in the room with windows open. Then

    A
    air pressure on the floor of the room equals the atmospheric pressure but the air pressure on the ceiling is negligible
    B
    air pressure is nearly the same on the floor, the walls and the ceiling
    C
    air pressure on the floor equals the weight of the air column inside the room (from floor to ceiling) per unit area
    D
    air pressure on the walls is zero since the weight of air acts downward

  • When red glass is heated in dark room it will seem

    A
    Green
    B
    Purple
    C
    Black
    D
    Yellow

    • Similar Questions

    Explore conceptually related problems

    What happens to the springs of a sofa when we sit on it ?

    What do you think would happen if all the depositors went to ask for their money at the same time?

    How can you see an object in the dark?

    What happens when iron objects are exposed to air?

    When we look at an object, an inverted diminished image of an object is formed on the retina of our eye. However, we see objects upright and of the appropriate size. How does this happen?

    Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

    Home
    Profile