Refraction of Light

From the figure answer the question

What is the power of the lens?

• - 0.025 D

• - 2.5 D

• + 0.025 D

• + 2.5 D

From the figure answer the following question.

If an object is placed at a distance of 15cm from the lens, what will be the size and nature of the image?

• Real and Diminished

• Virtual and diminished

• Real and Magnified

• Virtual and magnified

The figure shows the refraction of light in the eye. What kind of defect of the eye is indicated in the figure

• Myopia

• Night blindness

• Hypermetropia

• Retinal Detachment

From the figure determine the refractive index of medium b with respect to a, where a is air medium.

• 0.5

• 1.33

• 1.5

• 2

From the figure determine the power of the lens

• - 0.02D

• + 0.5D

• - 5D

• + 5D

To see the object placed more than 50cm away from a person who cannot see the distant object distinctly -

i) need a lens which is the same type of the stem

ii) need a lens of more power than that of given in the stem

iii) need a lens of power - 2D

Which one is correct?

• i and ii

• i and iii

• ii and iii

• i, ii and iii

According to the figure
 $When\ r=60\degree,\ which\ one\ is\ correct?$   

•  $i\ =\ 70\degree$  

•  $i\ <\ r$  

•  $i\ =\ \theta_c$  

•  $i\ =\ 60\degree$  

In which condition, the ray will come back in the media of glass?

• $\theta_{c\ }<\ 90\degree$

• $i\ >\ \theta_c$

• $i\ =\ 90\degree$

• $i\ >\ 90\degree$

What will be the refractive index, if the critical angle of the medium is  $45\degree$  with respect to air?

• 0.58

• 0.71

• 1.41

• 1.73

Which lens is used for the treatment of myopia?

• Concave

• Convex

• Plane

• Plane Concave