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A concave mirror has a focal length of 4 cm and an object 2 cm tall is placed 9 cm away from it find the nature position and size of image formed

Posted by Gautam Vats 5 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Shruti Janghu 5 years, 2 months ago

Nature of image----- real and inverted Also there ans is found out by the mirror formula as well as magnification

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Shruti Janghu 5 years, 2 months ago

V= -7.2 cm Height of image = -1.6

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Shobha Kumari 5 years, 2 months ago

f= -4cm u=-9cm v=? . . .1/u+1/v=1/f =1/-9+1/v=1/-4 =1/v=1/-4+1/9 =1/v=-9+4/36 =1/v=-5/36 =v=-7.2cm Hence, the position of image is at distance of 7.2 cm from the mirror. Now, m=-v/u =- (-7.2/-9) m=-0.8 Since, h1=2cm h2=? m=h1/h2 - 0.8=h2/2 H2=-1.6 Hence the size of image is 1.6cm and nature of image is real and inverted.

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Sakshi Jagtap 5 years, 2 months ago

h1= 2cm, u = -9cm, f = -4cm......... 1/v + 1/u = 1/f ............... 1/v = 1/f – 1/u = 1/(-4) – 1/(-9)............ = - (1/4) + 1/9 = (-9 + 4)/36 = - (5/36).............. V = - 7.2 cm........... The image is formed at a distance 7.2 cm in front of the mirror........... Again, m = - (v/u) = - (-7.2)/-9 = -0.8............. m = h2/h1 ⇒ -0.8 = h2/2 ⇒ h2 = -1.6 cm ............. So, image is 1.6 cm in size, real and inverted...........hope this helps uhh?

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CBSE > Class 10 > Science