Human Eye & Colourful World

_______________ Image is formed in human eye. (Type of image)

Name the colour sensitive cells present in retina.

• Cone Cells

• Rod Cells

• Both 'a' and 'b'

• None of the above

The near point for a normal human eye is -

• 25 m

• 2.5 m

• 25 cm

• 2.5 cm

Why the sky appear black to an astronaut?

What type of lens is used for correction of Presbyopia?

Draw a diagram to show refraction of light in a prism.

A myopic person has far point of 200cm. What is the nature and power of lens used to correct the defect?

Explain why the stars twinkle.

Write in brief the role of – (a) cornea, (b) pupil, (c) ciliary muscles.