. An object of height 6 cm is placed perpendicular to the principal axis of a


An object of height 6 cm is placed perpendicular to the  principal axis of a concave  lens of focal  length 5 cm. Use lens formula to determine the position, size and  nature of the image if the distance of the  object  from  the  lens  is 10 cm

Best Answer

Height of the object, h1 = 6 cm

 

Focal length of the concave  mirror, f = -5 cm

 

Position of the image,  v = ?                                Size of the image,  h2  = ?

 

Object distance, u = -10 cm

 

According to lens formula

 

An object of height 6 cm is placed perpendicular to the  principal axis of a

 

Concave mirrors are used as shaving mirrors because

 

 

Thus the image is formed at a distance of 3.3 cm from the concave lens. The negative (-)sign for image distance shows that the image is formed on the left side of the concave lens (i.e., virtual). The size of the image is 2 cm and the positive (+) sign for hand image shows that the image is erect

 

Thus a virtual, erect, diminished image is formed on .the same side of the object (i.e., left side)

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