Human Eye and Colourful World

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What is reflection from a smooth surface like that of a mirror called?

Random reflection

Distorted reflection

Regular reflection (correct)

Irregular reflection

Which type of objects shine in the light of other objects?

Luminous objects

Opaque objects

Illuminated objects (correct)

Transparent objects

What are objects known as that emit their own light?

Luminous objects (correct)

Opaque objects

Illuminated objects

Reflective objects

Where do we see nearly everything due to reflected light?

In natural daylight Signup and view all the answers

What is used to show someone how their hair has been cut at the back?

Periscope Signup and view all the answers

When may reflected rays be further reflected if incident on another mirror?

When using plane mirrors Signup and view all the answers

What is the part of the eye that controls the amount of light entering into the eye?

Iris Signup and view all the answers

Where in the eye does the lens focus light?

Retina Signup and view all the answers

Which type of cells in the retina are sensitive to bright light?

Cones Signup and view all the answers

What is the area called where there are no sensory cells, making vision impossible at that spot?

Blind Spot Signup and view all the answers

In which part of the eye is the lens thicker at the center?

Pupil Signup and view all the answers

What cells in the retina sense color?

Cones Signup and view all the answers

What is the purpose of using closed circuit television as mentioned in the text?

To enlarge printed material with suitable contrast and illumination Signup and view all the answers

Who developed the Braille system?

Louis Braille Signup and view all the answers

How many dot patterns or characters are there in the Braille system?

63 Signup and view all the answers

What do the dots arranged in cells of two vertical rows of three dots each represent in the Braille system?

Letters and combinations of letters Signup and view all the answers

When was the present Braille system adopted?

1932 Signup and view all the answers

What is the main function of telescopic aids mentioned in the text?

To view chalkboard and class demonstrations Signup and view all the answers

How do visually impaired people learn the Braille system?

By beginning with letters, then special characters and letter combinations Signup and view all the answers

What is one way Braille texts can be produced?

By hand or by machine Signup and view all the answers

Which visually impaired Indian achieved excellence as a singer?

Diwakar Signup and view all the answers

What degree did Ravindra Jain obtain despite being completely visually impaired?

Sangeet Prabhakar Signup and view all the answers

Who established an association for special education and rehabilitation of disabled in India?

Lal Advani Signup and view all the answers

At what age did Helen A.Keller lose her sight?

18 months old Signup and view all the answers

What happens when you bend the paper after spreading it on the table?

The incident ray, normal, and reflected ray are no longer in the same plane Signup and view all the answers

What does it indicate when you cannot see the reflected ray after bending the paper?

The incident ray, normal, and reflected ray all lie in the same plane Signup and view all the answers

What is one of the laws of reflection mentioned in the text?

Incident ray, normal, and reflected ray lie in the same plane Signup and view all the answers

In Class VII, what features of an image formed by a plane mirror did Boojho study?

Whether the image was erect or upside down Signup and view all the answers

What activity involving a source of light and a plane mirror is described in the text?

Activity 13.3 with source of light O placed in front of mirror PQ Signup and view all the answers

What should be drawn to determine the direction of reflected rays in the activity with a source of light and a plane mirror?

Normals at points A and C on the mirror Signup and view all the answers

Human Eye and Colourful World - Class VII

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