Answer the following questions: (2 marks each)
1. How does the Iris differ from Pupil?
2. Why the pupil dilates in the dark?
3. If an object 10cm high is placed at a distance of 50 cm from a plane mirror, find the size and the distance of the image.
4. What is the function of a periscope in a submarine?
5. How does the visually impaired can also read?
Answer it according to class 8 and each question must contain 2 sentences.
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Answers
Answer:
1)ans:8The iris is the ring-shaped membrane inside the eye. The pupil is the black hole or opening present in the center of the iris.
It surrounds an opening in the center called the pupil.
2)ans:The colored part around the pupil called the iris adjusts the size of the pupil. Its main function is to regulate the amount of light that enters the eye. In dim light the pupils dilate (open wider) so more light can enter.
3)ans:An object 10cm high is placed at a distance of 50cm from a plane mirror. The size of the image will be? A. 20cm.
4)ans:Submarines have periscopes so that people inside can what is on the surface of the water. A periscope is a useful example of the law of reflection at work.
Explanation:
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