Question

The focus length of a concave mirror is -10 cm, what will the size of 5 cm long object placed in front of mirror at 20 cm apart





fast plz.​

Answer 1

Answer:

= -460

Explanation:

become the mirror is 20 CM

that will be resize 10 tblhay minez

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Answer 2

Given :

• The focus length of a concave mirror is - 10 cm .
• Object distance (u) = - 20 cm. [concave mirror]
• Height of object = 5 cm.

To Find :

• The size of image formed .

Solution :

༒ Using Mirror Formula : 1/f = 1/v + 1/u

⪼ - 1/10 = 1/v +(- 1/20)

⪼ - 1/10 = 1/v - 1/20

⪼ 1/20 - 1/10 = 1/v

⪼ (1 - 2)/20 = 1/v

⪼ - 1/20 = 1/v

⪼ v = - 20

• Hence, the image distance = 20 cm.

༒ Using Magnification Formula : hi/ho = -v/u

⪼ hi/5 = -(- 20)/(- 20)

⪼ hi/5 = -1

⪼ hi = -5

• Hence , the height of the image = 5 cm.