Download App

STD 12 - 9. Ray optics abd optical instruments — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 9. Ray optics abd optical instruments4 Marks
MCQ
Find Image distance....$cm$
  • ✓
    $+50$
  • B
    $-50$
  • C
    $+10$
  • D
    $-10 $
✓

Answer

Correct option: A.
$+50$
a
For refraction through spherical surface,

$\frac{\mathrm{n}_{2}}{\mathrm{v}}-\frac{\mathrm{n}_{1}}{\mathrm{u}}=\frac{\mathrm{n}_{2}-\mathrm{n}_{1}}{\mathrm{R}} \Rightarrow \frac{3}{2 \mathrm{v}}-\frac{1}{-50}=\frac{3 / 2-1}{+10}$

$\Rightarrow \frac{3}{2 v}=\frac{1}{20}-\frac{1}{50}=\frac{3}{100}$

$\therefore \mathrm{v}=50 \mathrm{\,cm}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A uniform metallic wire has a resistance of $18\,\Omega $ and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is .................. $\Omega$
→
A gas is compressed adiabatically till its temperature is doubled. The ratio of its final volume to initial volume will be
→
The effect of temperature on Maxwell's speed distribution is correctly shown by
→
Melting point of ice
→
Water is flowing through a horizontal pipe of non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have
→
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
→
The density of a material in the shape of a cube is determined by measuring three sides of the cube and its mass. If the relative errors in measuring the mass and length are respectively $1.5\%$ and $1\%$, the maximum error in determining the density is   ........ $\%$
→
One face of a rectangular glass plate $6 \,cm$ thick is silvered. An object held $8\, cm$ in front of the first face, forms an image $12\, cm$ behind the silvered face. The refractive index of the glass is
→
The thermo $e.m.f.$ of a thermo-couple is $25\,\mu V{/^o}C$ at room temperature. A galvanometer of $40\, ohm$ resistance, capable of detecting current as low as ${10^{ - 5}}\,A,$ is connected with the thermocouple. The smallest temperature difference that can be detected by this system is ................ $^oC$
→
The electric field at a point on the equatorial plane at a distance $r$ from the centre of a dipole having dipole moment $\overrightarrow{ p }$ is given by, ($r >>$ separation of two charges forming the dipole, $\varepsilon_{0}$ - permittivity of free space)
→