10th Human Eye

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

• + 0.5 D

• -0.5 D

• + 0.2 D

• -0.2 D

A student sitting on the last bench can read the letters written on he blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?

• The near point of his eyes has receded away.

• The near point of his eyes has come closer to him.

• The far point of his eyes has come closer to him.

• The far point of his eyes has receded away.

A person having a myopic eye used the concave lens of focal length of 50 cm. Calculate the power of a lens.

• +2 D

• +0.2 D

• -0.2 D

• -2 D

Which parts of your eye are transparent?

• retina
• optic nerve
• cornea and lens
• iris

In dim light, your pupil will be 

• larger
• smaller

Tags

NGSS.MS-LS1-8

The first part of the eye that light hits. 

• lens
• cornea
• pupil
• retina

The vitreous humor is a liquid inside of your eye.  When light passes from the lens into the vitreous, the light changes medium.  What happens to light because of this medium change? 

• Light is transmitted.
• Light is reflected.
• Light is refracted.
• Light is absorbed. 

In order for your brain to process the light waves that enter your eye, what must your eye do to those waves before sending them to the brain?

• Nothing, the light waves just get sent to the brain.
• Light waves have to be converted into sound waves by the eye. 
• Light waves have to be converted into nerve impulses by the eye. 
• Light waves have to be refracted by the eye. 

Cones are light sensitive cells in the retina that

• give you color vision in bright light

• respond in dim light

• give you color vision in dim light

• respond in bright light

This part of the eye carries the message from your eye to the part of your brain that controls vision. 

• cornea
• lens
• optic nerve
• retina