EASY
10th Mizoram Board
IMPORTANT
Earn 100

A person needs a lens of power -5.5 diopters for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5 diopter. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?

Important Questions on The Human Eye and the Colourful World

MEDIUM
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 6
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
MEDIUM
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 7
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 8
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 9
What happens to the image distance in the eye when we increase the distance of an object from the eye?
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 10
Why do stars twinkle?
MEDIUM
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 11
Explain why the planets do not twinkle.
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 12
Why does the Sun appear reddish early in the morning?
EASY
10th Mizoram Board
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS X>Chapter 11 - The Human Eye and the Colourful World>EXERCISES>Q 13
Why does the sky appear dark instead of blue to an astronaut?