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All posts related to Light

Jhanvi Khurana
Shared from Light on Dec 01, 2012 6:14 AM

An object is placed at a distance of 10 cm from a convex lens. The distance between the object and the image is 40 cm. What is the focal length?

 
16 cm
15 cm
8 cm
7.5 cm
Please type your answer before submitting.
Jhanvi Khurana

The answer should be 12.5 .................................. as per i think

Ilesh Dev
Shared from Light - Reflection on Dec 24, 2011 8:12 AM

Which of the following statements is true for a concave mirror?

 
It has real focus.
The focal point always lies behind the mirror.
It has double foci.
All are true.
Please type your answer before submitting.
Kaarthik

I guess the answer is a bcoz in only one case image is formed behind the mirror when the object is kept in between pole and principal focus .the nature of the image formed in 5 positions is real in only one position it is virtual as i said above moreover i dont know what is meant by double foci i guess it means there are 2 focal points whereas image is formed at only one point

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Saurabh Jain
Shared from Light- Reflection on Jan 30, 2011 7:14 AM

If the incident ray makes an angle of 60o with the normal, the angle made by the reflected ray with the mirror will be _____.

 
90°
60°
30°
0°
Please type your answer before submitting.
Saurabh Jain

Tricky

Chandan Kumar
Shared from Lenses and Applications on Jan 29, 2011 7:41 AM

The S.I. unit of power of a lens is ________.

 
metre
centimetre
dioptre
None of these
Please type your answer before submitting.
Ashok Kumar

(iii) dioptre

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Shivam Bhardwaj
Shared from Light- Reflection on Jan 27, 2011 6:48 AM

An object is placed at the centre of curvature of a concave mirror. What would be the magnification of the image formed?

 
-1
-
+1
Please type your answer before submitting.
Shivam Bhardwaj

The answer of this qwestion is wrong