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प्रश्न
You do not enjoy watching a movie from a very short distance from the screen in a cinema hall. Why?
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उत्तर
Our eyes are designed to focus at a great variety of distances. To focus constantly at a short distance can make the lens focusing muscles fatigued. Therefore, we do not enjoy watching a movie from a very short distance from the screen in cinema hall.
संबंधित प्रश्न
Which defect of vision can be rectified:
by using a convex lens?
Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class.
What type of lenses-converging or diverging-would an optician prescribe for her?
Differentiate between members of the following pair with reference to what is asked in the bracket.
Rods and cones (sensitivity).
A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction.
Write whether the following is true or false:
A convex lens is used for correcting myopia.
Name the following:
The defect of the human eye caused due to the uneven surface of the cornea.
Choose the Odd One Out:
Myopia and hypermetropia can be corrected by:
A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.
Complete the following table by observing the given figures:
| Figure → |  |
 |
| Points ↓ | ||
| (a) Name of the defect | ______ | ______ |
| (b) Position of the image | ______ | ______ |
| (c) Lens used to correct the defect | ______ | ______ |
