Maharashtra State BoardHSC Science (General) 11th
Advertisement Remove all ads

Solve Numerical example. A point object is kept 10 cm away from one of the surfaces of a thick double convex lens of refractive index 1.5 and radii of curvature 10 cm and 8 cm. - Physics

Numerical

Solve Numerical example.

A point object is kept 10 cm away from one of the surfaces of a thick double convex lens of refractive index 1.5 and radii of curvature 10 cm and 8 cm. Central thickness of the lens is 2 cm. Determine location of the final image considering paraxial rays only.

Advertisement Remove all ads

Solution

Given that, R1 = 10 cm, R2 = – 8 cm, u = – 10 cm and n = 1.5
From lens maker’s equation,

`1/"f"=("n"-1)(1/"R"_1-1/"R"_2)`

∴ `1/"f"=(1.5-1)(1/10-1/-8)`

= `0.5xx9/40=9/80`

∴ f = `80/9` cm

Now,

`1/"f"=1/"v"-1/"u"`

∴ `1/"v"=1/"f"+1/"u"=9/80+1/-10=1/80`

∴ v = 80 cm

The final location of the image will be at 80 cm from the lens.

Concept: Refraction at a Spherical Surface and Lenses
  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

Balbharati Physics 11th Standard Maharashtra State Board
Chapter 9 Optics
Exercises | Q 4. (viii) | Page 187
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×