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प्रश्न
The angle formed between the normal and the refracted ray is known as the angle of incidence.
विकल्प
True
False
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उत्तर
False.
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संबंधित प्रश्न
Analyse the following observation table showing variation of image distance (v) with object distance (u) in case of a convex lens and answer the questions that follow, without doing any calculations:
| S. No. | Object distance u(cm) | Image distance v(cm) |
| 1 | −90 | +18 |
| 2 | −60 | +20 |
| 3 | −30 | +30 |
| 4 | −20 | +60 |
| 5 | −18 | +90 |
| 6 | −10 | +100 |
(a) What is the focal length of the convex lens? Give reason in support of your answer.
(b) Write the serial number of that observation which is not correct. How did you arrive at this conclusion?
(c) Take an appropriate scale to draw ray diagram for the observation at S. No. 4 and find the approximate value of magnification.
Which type of mirror has:
- positive focal length?
- negative focal length?
What is the nature of a mirror having a focal length of, +10 cm?
A ray of light of going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.
The radius of curvature of a convex mirror used as a rear view mirror in a moving car is 2.0 m. A truck is coming from behind it at a distance of 3.5 m. Calculate
- position and
- size of the image relative to the size of the truck.
- What will be the nature of the image?
Draw the given diagram in your answer book and complete it for the path of a ray of light after passing through the lens.
Name two factors on which the focal length of a lens depends.
Light travels in the same straight line path while passing through different media.
Write true or false
The focal length of a convex mirror is equal to its radius of curvature.
State two uses of a convex mirror.
