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The Human Eye and The Colourful World CBSE Class 10

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Question 1/20

Q 1. The day is lengthened by __________ due to atmospheric refraction.

Solution

The day is lengthened by 4 minutes due to atmospheric refraction.

Q 2. The Tyndall effect is caused by the scattering of light by ___________.  

Solution

The Tyndall effect is caused by the scattering of light by colloidal particles.

Q 3. The least distance of distinct vision is 

Solution

The least distance of distinct vision is 25 cm.

25 cm = 0.25 m

Q 4. Far-sightedness is also called ____________. 

Solution

Far-sightedness is also called hypermetropia.

Q 5. The person suffering from hypermetropia has 

Solution

The person suffering from hypermetropia has shortened eye-ball.

Q 6. The Sun appears red at sunset because ________. 

Solution

The Sun appears red at sunset because colour with longer wavelengths enters our eye.

Q 7. The ___________ controls the light entering the eyes. 

Solution

The iris controls the light entering the eyes.

Q 8. Light-sensitive cells are present in the 

Solution

Light-sensitive cells are present in the retina.

Q 9. Hypermetropia is corrected by a ________ lens. 

Solution

Hypermetropia is corrected by a convex lens.

Q 10. The angle of deviation is maximum for __________ colour. 

Solution

The angle of deviation is maximum for violet colour. 

Q 11. Light-sensitive cells called ________ identify the colour of objects. 

Solution

Light-sensitive cells called cones identify the colour of objects.

Q 12. _______ colour has the longest wavelength. 

Solution

Red colour has the longest wavelength.

Q 13. Short-sightedness is corrected by a __________. 

Solution

Short-sightedness is corrected by a concave lens.

Q 14. ________________ gets scattered easily.

Solution

Light with shorter wavelength

Light with shorter wavelength gets scattered easily.

Q 15. When a ray of light enters the prism, it bends 

Solution

When a ray of light enters the prism, it bends towards the normal. 

Q 16. Due to atmospheric reaction, the Sun appears ________ minutes before actual sunrise. 

Solution

Due to atmospheric reaction, the Sun appears 2 minutes before actual sunrise. 

Q 17. The condition in which the image is formed in front of the retina is called ___________. 

Solution

The condition in which the image is formed in front of the retina is called myopia.

Q 18. The bottom colour of the rainbow is 

Solution

The bottom colour of the rainbow is violet.

Q 19. Air having a high temperature is __________ medium. 

Solution

Air having a high temperature is an optically rarer medium.

Q 20. The top colour of the rainbow is 

Solution

The top colour of the rainbow is red.

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The Human Eye and The Colourful World Notes

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The Human Eye and The Colourful World

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