An astronomical telescope has an objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance of :
(1) 46.0 cm

(2) 50.0 cm  

(3) 54.0 cm

(4) 37.3 cm 

Subtopic:  Telescope |
 61%
From NCERT
NEET - 2016
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Match the corresponding entries of Column 1 with Column 2. [Where m is the magnification produced by the mirror]

Column 1                         Column 2 
A. m=-2                     a. Convex mirror   
B. m=-1/2                  b. Concave mirror
C. m=+2                    c. Real image
D. m=+1/2                 d. Virtual Image

(1)A->a and c;B->a and d; C->a and b; D->c and d

(2)A->a and d; B->b and c; C->b and d; D-> b and c

(3)A->c and d; B->b and d;C->b and c;D->a and d

(4)A->b and c; B->b and c; C->b and d; D->a and d

Subtopic:  Reflection at Spherical Surface |
 61%
From NCERT
NEET - 2016
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The angle of incidence for a ray of light at a refracting surface of a prism is 45°. The angle of prism is 60°. If the ray suffers minimum deviation through the prism, the angle of deviation and refracting index of the material of the prism respectively are

(a)30°,2

(b)45°,2

(c)30°,12

(d)45°,12

Subtopic:  Prisms |
 72%
From NCERT
NEET - 2016
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The refracting angle of a prism is \(A\), and refractive index of the material of the prism is \(\cot{\left(\frac{A}{2}\right)}\). The angle of minimum deviation is:
1. \(180^{\circ}-3A\)
2. \(180^{\circ}-2A\)
3. \(90^{\circ}-A\)
4. \(180^{\circ}+2A\)

Subtopic:  Prisms |
 78%
From NCERT
NEET - 2015
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In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of the objective lens. The eye-piece forms a real image of this line. The length of this image is l. The magnification of the telescope is:

(1)L/l+1

(2)L/l-1

(3)L+1/L-1

(4)L/l

Subtopic:  Telescope |
 54%
From NCERT
NEET - 2015
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If the focal length of the objective lens is increased, then magnifying power of :

(1) microscope will increase but that of telescope decrease

(2) microscope and telescope both will increase

(3) microscope and telescope both will decrease

(4) microscope will decrease but that of telescope will increase

Subtopic:  Telescope |
 64%
From NCERT
NEET - 2014
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The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index μ of the prism is

(1)2sinA

(2)2cosA

(3)1/2cosA

(4)tanA

Subtopic:  Prisms |
 71%
From NCERT
NEET - 2014
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A plane-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices \(\mu_1\) and \(\mu_2\) and \(R\) is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is:

1. \(\frac{R}{2(\mu_1+\mu_2)}\) 2. \(\frac{R}{2(\mu_1-\mu_2)}\)
3. \(\frac{R}{(\mu_1-\mu_2)}\) 4. \(\frac{2R}{(\mu_2-\mu_1)}\)
Subtopic:  Lens Makers' Formula |
 60%
From NCERT
NEET - 2013
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For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be

(1) 5 cm

(2) 25 cm

(3) 1.67 cm

(4) 1.5 cm

Subtopic:  Human Eye |
 61%
From NCERT
NEET - 2013
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When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index 

(1)equal to that of glass

(2)less than one

(3)greater than that of glass 

(4)less than that of glass

Subtopic:  Lenses |
 73%
From NCERT
NEET - 2012
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