Power (P) = 1/focal length (f). Therefore, f = 1/P = 1/(-2) = -0.5 m.

Using the mirror formula, 1/f = 1/v + 1/u. Here, v = -15 cm (real image) and u = -30 cm (object distance). Thus, 1/f = 1/(-15) + 1/(-30) = -1/10, so f = -10 cm.

Using the mirror formula 1/f = 1/v + 1/u, where u = -30 cm and v = -10 cm, we find f = 15 cm.

Using the mirror formula, 1/f = 1/v + 1/u; here, v = -15 cm (real image) and u = -30 cm. Thus, 1/f = 1/(-15) + 1/(-30) = -1/10, so f = 10 cm.

Using the lens formula 1/f = 1/v - 1/u, where v = 30 cm and u = -15 cm, we find f = 20 cm.

Using the lens formula 1/f = 1/v - 1/u, we have 1/f = 1/(-15) - 1/(-10) = -1/15 + 1/10 = -1/30, thus f = -30 cm.

For the image to be at infinity, the focal length must be equal to the object distance, hence f = 60 cm.

Using the lens maker's formula for a plano-convex lens, f = R/2 = 30 cm / 2 = 30 cm.

Using Coulomb's law, F = k * |q1 * q2| / r^2 = (9 × 10^9) * |2 × 10^-6 * -3 × 10^-6| / (0.5)^2 = -1.08 N.

The force experienced by a charge q in an electric field E is given by F = qE.

The force experienced by a charge q moving with velocity v in a magnetic field B is given by the Lorentz force law: F = q(v × B), which can be expressed as F = qvB sin(θ), where θ is the angle between the velocity and the magnetic field.

The magnetic force on a charge moving in a magnetic field is given by F = qvB sin(θ), where θ is the angle between the velocity and the magnetic field.

According to Newton's first law, no net force is required to maintain constant velocity.

The boiling point elevation is calculated using the formula ΔT_b = i * K_b * m, where i is the van 't Hoff factor.

The formula for calculating kinetic energy is KE = 1/2 mv², where m is mass and v is velocity.

The magnetic force on a charged particle is given by F = qvBsinθ, where q is the charge, v is the velocity, B is the magnetic field, and θ is the angle between v and B.

The number of moles is calculated using the formula: Moles = Mass / Molar Mass.

The work done by a force is calculated using the formula W = Fd, where F is the force and d is the distance moved in the direction of the force.

Gravitational potential energy is calculated using the formula PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

The correct formula for the angular position of the m-th order maximum is d sin θ = mλ.

The complex formed is Ag(NH3)2+, which is known as the diamminesilver(I) ion.

The equivalent resistance of two resistors in series is simply the sum of their resistances: R_eq = R1 + R2.

The fringe separation (β) is given by the formula β = λD/d, where λ is the wavelength, D is the distance to the screen, and d is the distance between the slits.

The fringe width (β) is given by the formula β = λD/d, where D is the distance from the slits to the screen and d is the distance between the slits.

The magnetic field inside a solenoid is given by B = μ₀(nI), where n is the number of turns per unit length.

The magnetic force on a charged particle is given by F = qvBsin(θ), where q is the charge, v is the velocity, B is the magnetic field strength, and θ is the angle between the velocity and the magnetic field.

The magnetic force on a charge moving in a magnetic field is given by F = qvBsinθ, where θ is the angle between v and B.

The magnetic force on a charged particle is given by F = qvBsinθ, where q is the charge, v is the velocity, B is the magnetic field strength, and θ is the angle between v and B.

The modulus of resilience is given by U = 1/2 * σ * ε, where σ is the yield stress and ε is the yield strain.

The total power in a series RLC circuit is given by P = VI cos(φ), where φ is the phase angle.