Question Text
Question 2 :
A spherical mirror and a thin spherical lens have each a focal length of $-15$ cm. The mirror and lens are likely to be :<br/>
Question 3 :
State whether true or false:<div>A concave lens forms a magnified or diminished image depending on the distance of object from it.<br/></div>
Question 4 :
The radius curvature for a convex lens is $40\ cm$, for each surface. Its refractive index is $1.5$. The local length will be
Question 5 :
A ray passing with which part of a lens emerges undeviated ?
Question 7 :
The focal length of a lens is $-0.4\ m$. The lens is:
Question 8 :
The magnification of an image by a convex lens is positive only when the project is placed:
Question 9 :
A camera is an optical instrument which makes use of a :
Question 11 :
The focal length of a lens is 0.1 m. Then the lens must be :
Question 12 :
A man focusses an inverted image formed by a lens. It can be
Question 13 :
Convexo-Concave is a type of ____ lens. Fill in the blank.
Question 14 :
Which of the following term is not associated with a lens ?
Question 16 :
<span>Fill in the blank. </span><div>A _____ is a piece of transparent glass bounded by two spherical surfaces. </div>
Question 17 :
A concave lens forms the image of an object which is :<br><br>
Question 20 :
Which of the following term is not associated with a lens?