Ray OpticsLens Maker's Formula and Lens Formula (NEET Physics): Questions 1  7 of 19
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Passage
Read the passage given below and answer the questions that follow:
A cylindrical tube filled with water is closed at its both ends by two silvered Plano convex lenses as shown in the figure. Refractive index of lenses L _{1} and L _{2} are 2.0 and 1.5 while their radii of curvature are 5 cm and 9 cm respectively. A point object is placed somewhere at a point O on the axis of cylindrical tube. It is found that the object and image coincide each other.
Question number: 1 (1 of 3 Based on Passage) Show Passage
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Question
The position of object w. r. t lens L _{1} is
Choices
Choice (4)  Response  

a.  10 cm  
b.  12 cm  
c.  8 cm  
d.  14 cm 
Question number: 2 (2 of 3 Based on Passage) Show Passage
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Question
The length of the cylindrical tube is
Choices
Choice (4)  Response  

a.  20 cm  
b.  18 cm  
c.  22 cm  
d.  16 cm 
Question number: 3 (3 of 3 Based on Passage) Show Passage
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Question
The position of object w. r. t lens L _{2} is
Choices
Choice (4)  Response  

a.  14 cm  
b.  10 cm  
c.  8 cm  
d.  12 cm 
Question number: 4
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Question
The focal length of the lens of the human eye is maximum when it is looking at an object at,
Choices
Choice (4)  Response  

a.  Infinity  
b.  Very near the eye.  
c.  25 cm from the eye  
d.  100 cm from the eye 
Question number: 5
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Question
A 35 mm film is to be projected on a 20 m wide screen situated at a distance of 40 m from the filmprojector. Calculate the focal length of projection lens.
Choices
Choice (4)  Response  

a.  20 mm  
b.  40 mm  
c.  35 mm  
d.  70 mm 
Question number: 6
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Question
What is the refractive index of material of a Planoconvex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 7
» Ray Optics » Lens Maker's Formula and Lens Formula
Assertion (Ꭺ)
The sun looks bigger at sunrise and sunset than at noon
Reason (Ꭱ)
The atmosphere of the earth, due to its density gradient, acts as a lens.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ  
b.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ  
c.  Ꭺ is false but Ꭱ is true  
d.  Both Ꭺ and Ꭱ are false 