Question
In the displacement method the distance between the object and the screen is $70\; cm$ and the focal length of the lens is $16 \;cm$, find the separation between the magnified and diminished image position of the lens.
✓
Answer
$d\,\, = \,\,\,\sqrt {{D^2} - 4\,{{f}}d} \,\,$
$=\,\,\sqrt {{{(70)}^2} - 4\,\, \times \,\,16\,\, \times \,\,70} \,\,\, = \,\,\sqrt {420} \,\,\, = \,\,20.5\,\,\,cm$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Inverse square law for illuminance is valid for
A laser is a coherent source because it contains
Four capacitors are connected in a circuit as shown in the figure. The effective capacitance in $\mu F$ between points $A$ and $B$ will be
→A string is used to pull a block of mass $m$ vertically up by a distance $h$ at a constant acceleration $\frac{g}{4}$. The work done by the tension in the string is ...............
→A Carnot engine has an efficiency of $50 \%$ when its source is at a temperature $327^{\circ}\,C$. The temperature of the sink is $.........^{\circ} C$
→Find out equivalent resistance between $A$ and $B$
→How many compounds among following give white crystals when reacted with sodium bisulphite
For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric $\left( U _{ e }\right)$ and magnetic $\left( U _{ m }\right)$ fields is
→A body of mass $m$ is projected at an angle of ${45^o}$ with the horizontal. If air resistance is negligible, then total change in momentum when it strikes the ground is
→A tuning fork and a sonometer wire were sounded together and produce $4$ beats per second. When the length of sonometer wire is $95 cm$ or $100 cm,$ the frequency of the tuning fork is ..... $Hz$
→