Figure `7.44` shows three similar lamps `L_(1) , L_(2), and L_(3)` connectged across a power supply. If the lamp ` L_(3)` fuses, how will the light emitted by `L_(1) and L_(2)` change?

figure-3.402 shows two lamps L_(1) and L_(2) in series and connected across 100 V battery. Find the power consumed by each lamp.

In the circuit shown in Fig. If both the lamps L_(1) and L_(2) are identical.

Let L_(1),L_(2),L_(3) be three straight lines a plane and n be the number of circles touching all the lines . Find the value of n.

Let L_(1),L_(2),L_(3) be three straight lines a plane and n be the number of circles touching all the lines . Find the value of n.

The energies of three consecutive energy levels L_(3), L_(2) and L_(1) of hydrogen atom are E_(0), 4E_(0)/9 and E_(0)/4 respectively. A photon of wavelength lambda is emitted for a transition L_(3) to L_(1) . What will be the wavelength of emission for transition L_(2) to L_(1) ?

(a) Explain with reason, how the power of a diverging lens changes when (i) it is kept in a medium of refractive index greater than that of the lens, (ii) incident red light is replaced by violet light. (b) Three lenses L_(1), L_(2), L_(3) each of focal length 30 cm are placed co-axially as shown in the figure. An object is held at 60 cm from the optic center of lens L_(1) . The final real image is formal at the focus of L_(3) . Calculate the separation between (i) (L_(1) and L_(2)) and " (ii) " (L_(2) and L_(3)) .

(a) Explain with reason, how the power of a diverging lens changes when (i) it is kept in a medium of refractive index greater than that of the lens, (ii) incident red light is replaced by violet light. (b) Three lenses L_(1), L_(2), L_(3) each of focal length 30 cm are placed co-axially as shown in the figure. An object is held at 60 cm from the optic center of lens L_(1) . The final real image is formal at the focus of L_(3) . Calculate the separation between (i) (L_(1) and L_(2)) and " (ii) " (L_(2) and L_(3)) .

You are given three lenses L_(1),L_(2) and L_(3) each of focal length 20 cm. An object is kept at 40 cm in front of L_(1), as shown. The final real image is formed at the focus 'I' of L_(3). Find the separations between L_(1),L_(2) and L_(3).