Page 169 - Science Class 08

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A. Tick (3) the correct op on.
1. A er passing through a prism, white light splits into:
(a) nine colours (b) seven colours
(c) two colours (d) three colours
2. The surfaces of a prism other than the two bases are:
(a) rectangles (b) squares

(c) parallelograms (d) ovals
3. A light-ray has its speed slowered when it enters a medium that is:
(a) denser (b) rarer
(c) of same density (d) none of these

4. The ray that comes out a er being refracted inside a medium is called the:
(a) incident ray (b) refracted ray
(c) emergent ray (d) none of these

B. Write the correct name for.
1. The light-ray striking a medium ____________________
2. The light-ray that had deflected inside a medium ____________________
3. The light-ray that emerges from a medium a er the deflec on ____________________

4. The medium in which light has the faster speed ____________________
5. The point at which the incident ray and its emergent ray
from a prism meet on producing ____________________

C. Name.
1. seven visible colours of a light spectrum:
_______________ _______________ _______________ _ ______________
_______________ _______________ _______________

2. two laws of refrac on:
_________________________________________________________________________
_________________________________________________________________________

D. Match the following columns.

Column I Column II
1. Op cal Density a. Sir Isaac Newton

2. Refrac on b. Allowing the light to pass through it
3. Lateral c. Displacement deflec on of light-rays

4. Spectrum d. Capacity to refract light
5. Transparent e. Sideways displacement

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