Which of these is a reason why a far-sighted person needs a convex lens to correct his vision?
Important Questions on The Human Eye and the Colourful World
The iris is a muscular diaphragm that controls the size of the pupil. It consists of two layers: the front pigmented fibrovascular layer known as a stroma and, beneath the stroma, pigmented epithelial cells. The colour of the eye is defined by the pigmentation of the iris.
Which of the following can be directly affected if the iris does not function properly?
Nanda saw rays of sunlight entering into a dark room as shown below. He then did something to the air in the room after which he was NOT able to see the rays of sunlight in the room. What is it that Nanda could have done to make the rays of sunlight invisible? Justify your answer.
Mars's atmosphere is composed mainly of carbon dioxide, nitrogen and argon and negligible amounts of oxygen, water vapour and methane.
Using the information given in the sentence above and knowledge about how rainbows are formed on Earth, explain why rainbow formation is impossible on Mars.
