Related InterviewSolutions

• It was a bright, sunny day in the morning when the classes started in the school. Suddenly dark clouds appeared in the sky. Due to this the classroom became quite dark. The teacher asked a student to switch on all the lights in the classroom. (a) Why did the teacher ask for all the lights to be switched on ? (b) What was the size of the pupil of the eyes of the students : (i) before the clouds appeared ? (ii) when classroom became quite dark ? (iii) when the lights were switched on ? (c) In which of the above mentioned three situations, the students will feel glare in their eyes and why ? (d) What values are exhibited by the teacher in this case ?
• The near point of a hypermetropic eye is 1 m. What is the nature and power of the lens required to correct this defect ? (Assume that the near point of the normal eye is 25 cm).
• Why do stars twinkle ?A.B.C.D.
• Explain why the planets do not twinkle .A.B.C.D.
• Why does the sum appear reddish in the morning ?A.B.C.D.
• Sanjay was going to his office in his car. While driving his car, Sanjay saw a man behind him on a motorcycle through his rear-view mirror. A woman was also sitting behind the man on the motorcycle. Through his rear-view mirror, Sanjay noticed that the saree of the woman was almost touching the spokes of motorcycle wheel. He signalled the motorcyclist to stop and alerted the woman. She tied her saree properly and thanked Sanjay for the alert. (a) What kind of mirror is used by Sanjay as rear-view mirror ? (b) State two characteristics of the image formed by such a rear-view mirror ? (c) What could have happened if Sanjay had not alerted the woman sitting at the back of motorcycle ? (d) What values are displayed by Sanjay in this incident ?
• Anahat is an eight year old girl who has just begun to learn swimming. At the moment she is in the swimming pool. Suddenly, Anahat finds that her earring has fallen into the water. It appears to her that the earring has not gone too deep. So, she begins to go further into swimming pool to retrieve her earring. Her trainer, who has been watching her movements, does not allow Anahat to go further and pulls her out of the swimming pool quickly. (a) Why does it appear to Anahat that her earring has not gone too deep in water ? Name the phenomenon involved. (b) Why does the trainer not allow Anahat to go further in the swimming pool ? (c) Give one example of the effect of phenomenon involved in the above episode in which a glass slab is used. (d) What values does the trainer show in the above episode ?
• Why is a normal eye not able to see clearby the objects placed closer than 25cm .A.B.C.D.
• What is meant by the power of accommodation of the eye ?A.B.C.D.
• A person with a myopic eye connot see object beyond 1.2 m distinctly what should be the type of the corretive lens used to restore proper vision ?A.B.C.D.