Question 1 :
A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in the figures. In which of the following cases , after dispersion, the third colour from the top corresponds to the colour of the sky?
Question 2 :
What is the thin membrane through which light enters the eye?
Question 3 :
Is the position of a star as seen by us its true position?
Question 4 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d5c273b230584979bec.JPG' />
In the above figure, the angle of refraction is
Question 5 :
Which of the following phenomena contributes significantly to the reddish appearence of the sun at sunrise or sunset?
Question 6 :
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 8 :
What is the far point and near point of the human eye with normal vision?
Question 9 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d5e273b230584979bee.JPG' />
In the above figure, the angle of deviation is
Question 10 :
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 11 :
When a person is not able to see distant objects clearly but can see nearby objects clearly, he is considered to be
Question 13 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d59273b230584979be9.JPG' />
In the above figure, the emergent ray is
Question 14 :
A person needs a lens of power -4.5 D for correction of her vision. What is the focal length of the corrective lens?
Question 15 :
For parallel refracting surfaces, the emergent ray intersects the incident ray. State whether the statement is true or false.
Question 18 :
A person is advised to wear spectacles with convex lens. What defect of eye is he suffering from?
Question 19 :
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from?
Question 21 :
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 22 :
The reddish appearence of sun at sunrise or sunset is because
Question 24 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d5d273b230584979bed.JPG' />
In the above figure, the angle of emergence is
Question 25 :
What is the ability of eye to focus on both near and far objects known as?
Question 26 :
The ability of the eye lens to adjust its focal length is called accommodation of eye. State whether the given statement is true or false.
Question 27 :
The human eye forms an image of an object at its
Question 28 :
A person can see objects lying between 0.5 m and 2 m. He is suffering from
Question 30 :
The least distance of distinct vision for a young adult with normal vision is about
Question 32 :
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 33 :
What is the far point and near point of the human eye with normal vision?
Question 34 :
Water of the ocean appear dark in the night. State whether the statement is true or false.
Question 35 :
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
Question 36 :
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 37 :
Which of the following statement is correct regarding the propagation of light of different colours of white light in air?
Question 38 :
State TRUE or FALSE: A person with myopia can see nearby objects clearly
Question 40 :
What is the splitting of white light into components known as ?
Question 41 :
Assertion(A) : The Sun appears flattened at sunrise and sunset.
Reason (R) : The apparent flattering of the Sun's disc at sunrise and sunset is due to atmospheric refraction.
Question 42 :
Blue colour of sky and reddening of sky at sunrise and sunset is due to
Question 43 :
A person with hypermetropia can see nearby objects clearly but cannot see distant objects distinctly. State whether the given statement is true or false.
Question 45 :
State TRUE or FALSE : The angle of deviation is the angle between the direction of the refracted ray and the direction of the incident ray when a ray of light passes from one medium to the other.
Question 46 :
Hypermetropia is generally caused in the people having higher age. State whether the statement is true or false.
Question 47 :
A rainbow is always formed in a direction ______ to that of the Sun.
Question 48 :
Which is the least deviated colour when white light passes through a prism?
Question 49 :
We cannot observe the path of light through a true solution. TRUE or FALSE?
Question 50 :
A student has difficulty reading the blackboard while sitting in the last row. How can the defect be corrected?
