MCQ
Which of objective lens is used in reflector telescope :
- Aplane mirror
- ✓concave mirror
- Cconvex lens
- Dprism
✓
Answer
Correct option: B.
concave mirror
(B) - concave mirror
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
When the current through the electromagnet of a relay reaches a particular value:
A hemispherical bowl of mass $m$ is uniformly charged with charge density $'\sigma '$ . Electric potential due to charge distribution at a point $'A'$ is (which lies at centre of radius as shown).
→A positive point charge is released from rest at a distance $r_0$ from a positive line charge with uniform density. The speed $(v)$ of the point charge, as a function of instantaneous distance $r$ from line charge, is proportional to
→Which of the following pairs of physical quantities may be represented in the same unit?
Bartholinus discovered:
A coil of one loop is made from a wire of length $L$ and after that a coil of 2 loops is made from the same wire. The ratio of magnetic fields at the center is :
→Consider the following figure, a uniform magnetic field of $0.2\, T$ is directed along the positive $X-$ axis. The magnetic flux through top surface of the figure is ....... $\,m-W b$
→The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is
Potentiometer measures potential more accurately because
Assume that an electric field $\overrightarrow E = 30{x^2}\hat i$ exists in space. Then the potential difference $V_A -V_O$, where $V_O$ is the potential at the origin and $V_A$ the potential at $x = 2\, m$ is
→