Asked/Added Questions From NCERT:


Question 1. Asked on :31 January 2019:10:17:28 AM

 What is concave mirror

-Added by praful kumar Science » Light

Answer:

Himanshi Verma

 concave mirror, or converging mirror, has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point.They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror

-Answered by Himanshi Verma On 02 February 2019:01:23:17 PM


Question 2. Asked on :31 January 2019:10:11:31 AM

 What is convex mirror.

-Added by praful kumar Science » Light

Answer:

Himanshi Verma

 If the reflecting surface of a spherical mirror is called a con cave mirror 

-Answered by Himanshi Verma On 02 February 2019:01:22:55 PM


Question 3. Asked on :31 January 2019:09:56:28 AM

What is virtual image.

-Added by praful kumar Science » Light

Answer:

Himanshi Verma

 The image formed by a place mirror could  not obtained on a screen such as image is    called avirtual image 

-Answered by Himanshi Verma On 02 February 2019:01:31:56 PM


Question 4. Asked on :29 January 2019:10:31:40 AM

 Ozone acts as a natural shield against ultraviolet radiation explane.

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation  [UVR] from the sun, protecting life on Earth from its potentially harmful effects. ... That is,the lower the ozone levels, the higher the solar  [UVR.] 

-Answered by Himanshi Verma On 02 February 2019:01:33:23 PM


Question 5. Asked on :28 January 2019:05:13:32 PM

 What is the PRISM ? 

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 A transparent material with three rectangular surfaces used for obtaining spectrum of light

-Answered by Himanshi Verma On 02 February 2019:01:33:40 PM


Question 6. Asked on :28 January 2019:04:42:18 PM

 State the characteristics of the image formed by a plain mirror .

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 The image formed by a concave lens is always virtual, upright and erect. Question 4: State the characteristics of the image formed by a plane mirror. Answer: The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the object.

-Answered by Himanshi Verma On 02 February 2019:01:36:08 PM


Question 7. Asked on :28 January 2019:04:38:26 PM

State the differences between a convex and a concave lens . 

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 Convex lens: Thick at middle thin at edges. Can form real image.

Concave lens: Thin at middle thick at edges. Can form virtual image

-Answered by Himanshi Verma On 02 February 2019:01:37:24 PM


 

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