1) QUIZ:
1) Name the place where image is formed in the eye?
2) Name the muscular diaphragm that controls the size of the pupil?
3) What is the cause of dispersion of light?
4) Which color has got more wave length?
5) How many colors evolve when white light disperses?
6) What is the reason for the different deviation?
7) Who discovered that white light consists of seven colors?
8) What makes bees respond the ultraviolet light?
Answers
Answer:
a- retina
b- pupil
c-The nature of light was a major controversy in the sciences in the 1600s, and prisms were at the center of the storm. Some scientists believed light was a wave phenomenon, and some thought it was a particle. English physicist and mathematician Sir Isaac Newton was in the former camp – arguably its leader – while Dutch philosopher Christiaan Huygens headed up the opposition.
d-red
e- 7 colors
f-a navigation : deflection of the needle of a compass caused by local magnetic influences (as in a ship)
g-isaac nweton
Answer:
1⇒ Retina.
2⇒ Iris.
3⇒ The cause of dispersion is that different colours of white light having different wavelengths deviate through different angles on passing through a glass prism. That is why they split on coming out from the prism along different directions.
4⇒ Violet.
5⇒ Seven.
6⇒ The causes of dispersion of white light is the change in the speed of light with wavelength when white light enters the first surface of the prism light of different colours due to the different speed in Glass get deflected through different angles towards the base of the prism.
7⇒ Isaac Newton.
8⇒ The retinal cones of bees are sensitive to ultraviolet light which allow them to respond to ultraviolet. Bees eyes have evolved to allow them to see in the ultraviolet.
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