19. A pole stands in a river, half in and half out of the water. Another pole of

Question

19. A pole stands in a river, half in and half out of the water. Another pole of the same length stands vertically on the shore at a place where the ground is level. The shadow cast by the pole in the river on 1 the river bottom is: A) slightly longer than the shadow of the pole on land B) much longer than the shadow of the pole on land C) shorter than the shadow of the pole on land D) shorter than the shadow of the pole on land if the sun is high and longer if the sun is low E) the same length as the shadow of the pole on land

Explanation / Answer

Correct Answer is:

(C)Shorter than the shadow of the pole on land

This is because, light moves slower in denser mediums. Water as compared to air is denser, so speed of light in water will be lesser than in air. The light rays after dropping on the pole, falls in water, the angle at floow will be steeper now and hence the image will be shorter.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.