A double convex lens is placed on a horizontal plane mirror. A pin held horizontally above the lens coincides with its own image when it is 18cm from the lens. The space between the lens and the mirror is filled with glycerine and water, turn by turn, and the positions of coincidence of the pin with the image are 28 cm and 24 cm from the lens, respectively. Calculate the refractive index of glycerine, given that the refractive index of water is 4/3.

A double convex lens is placed on a horizontal plane mirror. A pin hel

1.	A double convex lens is placed on a horizontal plane mirror. A pin held horizontally above the lens coincides with its own image when it is 18cm from the lens. The space between the lens and the mirror is filled with glycerine and water, turn by turn, and the positions of coincidence of the pin with the image are 28 cm and 24 cm from the lens, respectively. Calculate the refractive index of glycerine, given that the refractive index of water is 4/3.
Answer» ANSWER :1.48

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