Nivedita Bose and Madhur Gupta Solutions for Chapter: Light, Exercise 2: Worksheet FA
Nivedita Bose Science Solutions for Exercise - Nivedita Bose and Madhur Gupta Solutions for Chapter: Light, Exercise 2: Worksheet FA
Attempt the practice questions on Chapter 15: Light, Exercise 2: Worksheet FA with hints and solutions to strengthen your understanding. LEARNING edge SCIENCE and TECHNOLOGY 7 solutions are prepared by Experienced Embibe Experts.
Questions from Nivedita Bose and Madhur Gupta Solutions for Chapter: Light, Exercise 2: Worksheet FA with Hints & Solutions
Read the following passage and answer the following questions.
Lenses in our eyes
In class 6 you learnt about pinhole camera. The human eye also works as a pinhole camera with two lenses. The pupil acts as a pinhole. Light falls on the cornea which acts as a converging lens. Then it falls on 'the lens’ which is behind the cornea. Through the lens, the light falls on the retina to form a real image. To focus on objects, animals can move the lens or change its shape. Fish move their lens backward and forward to focus the image of objects on their retina. Mammals change the shape of their lens. When we have to focus on the objects at a distance our lenses become thin. Due to this the light coming from the object bends less. When we focus on nearby objects, the lenses become thicker. As a result the light coming from the object bends more and falls on the retina. The shape of lenses is changed by muscles around it. When the lens needs to be thin, the muscles relax and when the lens needs to be thick, they contract. For this reason, when you read for a long time, your muscles are contracted continuously and your eyes feel tired.
How many lenses are there in our eyes?
Read the following passage and answer the following questions.
Lenses in our eyes
In class 6 you learned about pinhole cameras. The human eye also works like a pinhole camera with two lenses. The pupil acts as a pinhole. Light falls on the cornea which acts as a converging lens. Then it falls on 'the lens’ which is behind the cornea. Through the lens, the light falls on the retina to form a real image. To focus on objects, animals can move the lens or change its shape. Fish move their lens backward and forward to focus the image of objects on their retina. Mammals change the shape of their lens. When we have to focus on the objects at a distance our lenses become thin. Due to this the light coming from the object bends less. When we focus on nearby objects, the lenses become thicker. As a result, the light coming from the object bends more and falls on the retina. The shape of lenses is changed by the surrounding muscles. When the lens needs to be thin, the muscles relax and when the lens needs to be thick, they contract. For this reason, when you read for a long time, your muscles are contracted continuously and your eyes feel tired.
What acts as a pinhole in our eyes?
No matter how far is the object from the mirror, the image of the object appears erect. The mirror is _____.
A boy is standing at a distance of in front of a plane mirror. The distance between the boy and his image is _____ .
A beam of light falls on a plane mirror at an angle of .
What is the angle of incidence?
A beam of light falls on a plane mirror at an angle of .
What is the angle of reflection?
We should not leave glass bottles in a forest. Try to give a reason for this.
Roy was looking at a paper through a magnifying glass in sunlight. After some time, the paper started burning. Can you explain what happened?
