The Human Eye and the Colourful World

Question 2The human eye forms the image of an object at itscorneairispupilretina

Question 5A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power...

Question 6The 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?

Question 7Make 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...

Question 8Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

Question 9What happens to the image distance in the eye when we increase the distance of an object from the eye?

Question 10Why do stars twinkle?

Question 11Explain why the planets do not twinkle.

Question 12Why does the sky appear dark instead of blue to an astronaut?

Question 1What is meant by power of accommodation of the eye?

Question 3What is the far point and near point of the human eye with normal vision?

Question 4A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How...