Home
Class 11
PHYSICS
A diver in a lake wants to signal his di...

A diver in a lake wants to signal his distress to a person sitting on the edge of the lake flashing his waterproof torch. He should direct the beam

A

Vertically upwards

B

Horizontal

C

At an angle to the vertical which is slightly more than the critical angle

D

At an angle to the vertical which is slightly less than the critical angle

Text Solution

Verified by Experts

The correct Answer is:
D
The light has to travel from water to air . If `igt C` , it will suffer total internal reflection . If `ilt C` , then it will enter air and the person on the edge of the lake will get the changer signal . If `i` = C , the ray will go parallel to the surface of separation .
Promotional Banner

Topper's Solved these Questions

  • REFRACTION OF LIGHT

    MARVEL PUBLICATION|Exercise Test Your Grasp|10 Videos

  • RAY OPTICS (MIRRORS, LENSES AND OPTICAL INSTRUMENTS)

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

  • VECTORS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

Similar Questions

Explore conceptually related problems

A diver in a swimming poole wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light

A man at the bottom of a pool wants to signal to a person lying at the edge of the pool. The man should beam his water proof light ___________ .

A boat man could row his boat with a speed 10 m/sec. He wants to take his boat from P to a point Q just opposite on the other bank of the river flowing at a speed 4 m/sec. He should row his boat–

If a man wants to hit a target, he should point his rifle-

The rate of simple interest in two banks A and B are in the ratio 5:4 . A person wants to deposit his total savings in two banks in such a way that he received equal half-yearly interest from both. He should deposit the savings in the banks A and B in the ratio

A fat person is standing oa ligh plank floating on a calm lake. The person walks from one end to the other on the plank. His friend sitting on the shore watches him and finds that the person hardly moves any distance because the plank moves basckward about the same distance as the person moves on the plank. Explain.