Question 1 :
The bluish colour of water in deep sea is due to
Question 3 :
A student has difficulty reading the blackboard while sitting in the last row. How can the defect be corrected?
Question 4 :
State TRUE or FALSE : Human eye is able to see nearby and distant objects clearly by changing the focal length of the eye lens using its power of accomodation.
Question 5 :
The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to
Question 6 :
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
Question 7 :
Scattering of light can happen in the absence of atmosphere. TRUE or FALSE?
Question 8 :
State TRUE or FALSE : We are able to see nearby and distant objects clearly by changing the focal length of the eye lens using its power of accomodation.
Question 9 :
What is the far point and near point of the human eye with normal vision?
Question 10 :
Myopia is also known as far-sightedness. State whether the given statement is true or false.
Question 11 :
Which is the least deviated colour when white light passes through a prism?
Question 12 :
Which of the following phenomena contributes significantly to the reddish appearence of the sun at sunrise or sunset?
Question 13 :
A person needs a lens of power -4.5 D for correction of her vision. What is the nature of the corrective lens?
Question 14 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d58273b230584979be7.JPG' />
In the above figure, the incident ray is
Question 15 :
The change in focal length of an eye lens is caused by the action of the
Question 16 :
State TRUE or FALSE: A person with myopia can see nearby objects clearly
Question 17 :
What is the angle between two lateral surfaces of a prism known as?
Question 18 :
What is the approximate time of advanced sunrise and delayed sunset?
Question 19 :
State TRUE or FALSE: A person with hypermetropia can see nearby objects clearly
Question 21 :
What is the splitting of white light into components known as ?
Question 22 :
The eye lens forms an inverted real image of the object on the retina. State whether the statement is true or false.
Question 23 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d59273b230584979be8.JPG' />
In the above figure, the refracted ray is
Question 24 :
The angle of actual position and apparent position of a star are _______ when the star is present directly above our head.
Question 25 :
The reddish appearence of sun at sunrise or sunset is because
Question 26 :
Name the muscles responsible for bringing change in the focal length of the eye.
Question 27 :
What happens when the size of the particle gets too big?
Question 29 :
Which part of the eye regulates the amount of light entering the eye?
Question 31 :
We cannot observe the path of light through a true solution. TRUE or FALSE?
Question 34 :
Which is the most deviated colour when white light passes through a prism?
Question 35 :
Sky appears blue to an astronaut. State whether the statement is true or false.
Question 36 :
Assertion (A): The stars twinkle, while the planets do not.
Reason (R) : The stars are much bigger in size than the planets.
Question 37 :
The human eye forms an image of an object at its
Question 38 :
A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting near vision?
Question 40 :
The sky appears ______ to those who travel at high altitudes.
Question 41 :
Presbyopia arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens. State whether the statement is true or false.
Question 42 :
Which of the following is a correct example of scattering of light?
Question 44 :
A person needs a lens of power -4.5 D for correction of her vision. What kind of defect in vision is she suffering from?
Question 45 :
When a person is not able to see distant objects clearly but can see nearby objects clearly, he is considered to be
Question 46 :
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from?
Question 47 :
A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting distant vision?
Question 48 :
A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting near vision?
Question 49 :
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Question 50 :
What is the ability of eye to focus on both near and far objects known as?
