It was dusk when Kumar returned home from play. He saw his grandfather
struggling to read the newspaper. Kumar immediately switched on the light
overhead and handed over his grandfather spectacles to him.
1. What values did Kumar display?
2. What lens was used in Kumar’s grandfather’s spectacles?
3. How your eyes will be impacted with COVID-19 if you rub them with your
dirty hands?
4.Why do you blink your eyes?
5. Draw neat and labelled diagram of Structure of Eye.
Q-3 Read about how a telescope is made and make a list of lenses and mirrors
used in making a powerful telescope. Use pictures or diagrams to explain your
point. Q-4 Create a fact sheet on World Environment Day[at least 8 facts]. Create a
logo for the World Environment Day of your own. (10)
Q-5 Burhanuddin’s father was concerned about the increase in the electricity
bills in their home. He requested every member of the family to take some
steps to reduce the consumption of electricity. Next month, there was a
reduction in the bill. (05)
1.List the steps that each member of the family could have taken to reduce
the consumption of electricity. Which of them do you follow in your
house.Will you suggest same things to your friends and relatives?
2.How can you safely find out if a material carries electricity or stops it
passing?
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Answer:
The power of accommodation of the eye usually decreases with ageing. For most people, the near point gradually recedes away. They find it difficult to see nearby objects comfortably and distinctly without corrective eye-glasses. This defect is called Presbyopia.It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens.
This defect is corrected using a bifocal lens whose upper portion consists of a concave lens that facilitates distant vision and the lower part is a convex lens which facilitates near vision.
Explanation:
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