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Chayanika Guin

Nov 16, 2013



Nidhi Maithani

Dec 3, 2014



Unmukt

Jan 19, 2014

#### uses of convex lens in daily life.,.



Some uses of convex lens are:

Piyush chavan

Mar 3, 2015



Venkatesh

Nov 21, 2013



V.m.hameed

Jan 28, 2015

#### If the speed of light in vacuum is 3x10⁸ m/s, find the speed of light in a medium of absolute refractive index 1.5.



Neeraja Babu Babu

Mar 3, 2015



David

Dec 5, 2014

#### An object 5 cm in size is placed at a distance of 20 cm from the concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed to get a sharp image? Also find the height of the image.



Object-size, h = + 5.0 cm;
Object-distance, u = – 20.0 cm;
Focal length, f = –15.0 cm;
Image-distance, v = ?
Image-size, h′ = ?
Mirror formula is ...

Sai Bhargav Karnati

Dec 4, 2014

#### What for concave and convex mirrors and lenses are used?



Uses of Concave Mirrors
• Concave mirrors are used as shaving mirrors to see a larger image of the face.
• Dentists use concave mirrors to view the back of the tooth. ENT doc...

Santosh kumar

Feb 24, 2014

#### the phenomenon of twinkling the stars took place why ?



The phenomenon that causes stars to twinkle is atmospheric refraction. That is, the air above us is a big ocean of not very dense fluid that has a small bending effect on light that passes through it. If it wer...

Chayanika Guin

Nov 16, 2013



Nidhi Maithani

Dec 3, 2014



Unmukt

Jan 19, 2014

#### uses of convex lens in daily life.,.



Some uses of convex lens are:

Piyush chavan

Mar 3, 2015



Venkatesh

Nov 21, 2013



V.m.hameed

Jan 28, 2015

#### If the speed of light in vacuum is 3x10⁸ m/s, find the speed of light in a medium of absolute refractive index 1.5.



Neeraja Babu Babu

Mar 3, 2015



David

Dec 5, 2014

#### An object 5 cm in size is placed at a distance of 20 cm from the concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed to get a sharp image? Also find the height of the image.



Object-size, h = + 5.0 cm;
Object-distance, u = – 20.0 cm;
Focal length, f = –15.0 cm;
Image-distance, v = ?
Image-size, h′ = ?
Mirror formula is ...

Sai Bhargav Karnati

Dec 4, 2014

#### What for concave and convex mirrors and lenses are used?



Uses of Concave Mirrors
• Concave mirrors are used as shaving mirrors to see a larger image of the face.
• Dentists use concave mirrors to view the back of the tooth. ENT doc...

Santosh kumar

Feb 24, 2014

#### the phenomenon of twinkling the stars took place why ?



The phenomenon that causes stars to twinkle is atmospheric refraction. That is, the air above us is a big ocean of not very dense fluid that has a small bending effect on light that passes through it. If it wer...

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