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Letusknowwhy
Apr 25, 2014
What is power of lens?
Letusknowwhy
Apr 25, 2014
What is magnifiaction of lens?
Madhurima Majumdar
May 24, 2014
what is first focus and second focus?What is the difference between them?
Answer: as a lens has two curved surfaces each curvature has a radius. So the lens has t...
Madhurima Majumdar
May 26, 2014
how does the magnifying glass enlarge the image?what is its principle?Explain.
Answer: Magnifying glass enlarges or diminishes the image due to the refraction de...
Nandita Menon
Aug 10, 2014
convex lens are also used as spectacles or not?
Pawan Rout
Aug 21, 2015
WHAT IS INTERNAL REFLECTION?
called internal...
Debraj
Feb 18, 2016
How to derive the gaussian's form of lens equation?
The derivation of the Gaussian form proceeds from triangle geometry. For a thin lens, the lens power P is the sum of the surface powers. For thicker lenses, Gullstrand's equation can ...
Siddhartha
Oct 9, 2017
1) If half part of the lens is covered,the focal length does not change but the intensity decreases. Why?
2) A convex lens is placed in water. Its focal length will increase. Why?
3) The focal length of a thin convex lens is more than that of a thick convex lens. Why?
2) A convex lens is placed in water. Its focal length will increase. Why?
3) The focal length of a thin convex lens is more than that of a thick convex lens. Why?
To draw an image we just need two refracted rays. If you cover a half of lens then it won't receive light and therefore the light rays contributing in the image formation will be less and therefor...
Letusknowwhy
Apr 25, 2014
What is power of lens?
Letusknowwhy
Apr 25, 2014
What is magnifiaction of lens?
Madhurima Majumdar
May 24, 2014
what is first focus and second focus?What is the difference between them?
Answer: as a lens has two curved surfaces each curvature has a radius. So the lens has t...
Madhurima Majumdar
May 26, 2014
how does the magnifying glass enlarge the image?what is its principle?Explain.
Answer: Magnifying glass enlarges or diminishes the image due to the refraction de...
Nandita Menon
Aug 10, 2014
convex lens are also used as spectacles or not?
Pawan Rout
Aug 21, 2015
WHAT IS INTERNAL REFLECTION?
called internal...
Debraj
Feb 18, 2016
How to derive the gaussian's form of lens equation?
The derivation of the Gaussian form proceeds from triangle geometry. For a thin lens, the lens power P is the sum of the surface powers. For thicker lenses, Gullstrand's equation can ...
Siddhartha
Oct 9, 2017
1) If half part of the lens is covered,the focal length does not change but the intensity decreases. Why?
2) A convex lens is placed in water. Its focal length will increase. Why?
3) The focal length of a thin convex lens is more than that of a thick convex lens. Why?
2) A convex lens is placed in water. Its focal length will increase. Why?
3) The focal length of a thin convex lens is more than that of a thick convex lens. Why?
To draw an image we just need two refracted rays. If you cover a half of lens then it won't receive light and therefore the light rays contributing in the image formation will be less and therefor...