Ray OpticsPower of a Lens (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  5 of 8
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Question number: 1
» Ray Optics » Power of a Lens
Question
The plane surface of a Planoconvex lens is silvered If radius of curved surface is R and refractive index is µ, then the system behaves like a concave mirror whose radius will be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 2
» Ray Optics » Power of a Lens
Question
The power of a Planoconvex lens is P. If this lens is cut longitudinally along its principal axis into two equal parts and then they are joined as given in the figure. The power of combination will be
Choices
Choice (4)  Response  

a.  P 

b.  2P 

c. 


d.  Zero 

Question number: 3
» Ray Optics » Power of a Lens
Question
An equiconvex lens has a power of 5 diopter. If it is made of glass of refractive index 1.5 then the radius of the curvature of each surface will be
Choices
Choice (4)  Response  

a.  zero 

b.  10 cm 

c.  20 cm 

d.  5 cm 

Question number: 4
» Ray Optics » Power of a Lens
Question
A convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 5
» Ray Optics » Power of a Lens
Question
A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is 75 cm. On displacing the lens from first position by 25 cm to the second position again a real image is formed on the screen. Then the focal length of the lens is
Choices
Choice (4)  Response  

a.  16.7 cm 

b.  25.0 cm 

c.  33.3 cm 

d.  50.3 cm 
