A plane glass slab is kept over?coloured letters, the letter which appears least raised is
1). Green
2). Violet?
3). Red
4). Blue
Which famous scientist was the first to look at the night sky throught a telescope?
1). Comernicus
2). ?Newton?
3). Michael Faraday
4). Galileo
The colour of stars depends upon?their
1). Temperature
2). Pressure
3). Age
4). Distance from Solar System
A ray of light when refracted suffers change in velocity. In theis context, which one among the following statements is correct ?
1). Velocity increases as the ray passes from a rarer to a denser medium
2). Velocity decreases as the ray passes from a denser to a rarer medium
3). Velocity decreases as the ray passes from a rarer to a denser medium
4). Change of velocity does not depend on the nature of medium
Total internal reflection cannot take place when light goes from:
1). water to glass?
2). ?water to air?
3). glass to air
4). glass to water?