Ray Optics (NEET Physics): Questions 34  38 of 102
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Question number: 34
» Ray Optics » Lens Maker's Formula and Lens Formula
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: 35
» Ray Optics » Magnification
Question
The relation between the linear magnification m, the object distance u and the focal length f for a spherical mirror is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 36
» 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 
Question number: 37
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Question
The light gathering power of a camera lens doesn’t depend on
(1) Ratio of focal length and diameter
(2) Product of focal length and diameter
(3) Wavelength of light used
(4) Its diameter
Select the correct answers and mark it according to the following codes:
Codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct  
b.  1, 2 and 3 are correct  
c.  2 and 4 are correc  
d.  1 and 3 are correct 
Question number: 38
» Ray Optics » Lens Maker's Formula and Lens Formula
Question
A convex lens of focal length 10.0 cm is placed in contact with a convex lens of 15.0 cm focal length. What is the focal length of the combination?
Choices
Choice (4)  Response  

a.  4 cm  
b.  12 cm  
c.  8 cm  
d.  6 cm 